Categories
Diamond Recommend

This James Allen (merged with bluenile) diamond is not worth buying?

Not all diamonds are worth buying!!!
Both milky tint and brown hue:Tap to see full diamond info
This diamond has milky:Click view detailed diamond information
This diamond has green fluorescence.:View diamond details
This diamond has a cavity:See the diamond details

Diamond custom sellers change super fast every single day. The industry updates all the time. For example, bluenile and jamesallen have merged into one company now. No matter how the sellers shift, basic diamond knowledge never change. These rules stay the same forever.

One net friend messaged me online today. He sent me details of a diamond sold on James allen. He asked me to check if this stone worth buying. He also wanted to know whether the diamond quality is good or bad. The full information of this diamond’s GIA certificate is shown in the picture below. I took a close look at its cut proportions and physical measurements first. At first glance, this diamond looks like an ideal one. It gets three excellent cut grades totally. Diamonds with triple excellent cut always own strong fire sparkle. Its color grade is H, clarity grade VS2. Both ranks bring pretty good cost performance for regular buyers.

James Allen (merged with bluenile) diamond GIA certi

However, I spotted one bad mark on the flaw diagram of the certificate. The flaw type marked is cavity. This single defect cut down the diamond’s overall score a lot. Many normal inclusions are crystal, feather and needle. They appear much more frequently in loose diamonds. Compare to those common flaws, cavity brings far worse long-term influences to diamond quality. Let me explain its meaning clearly. The word cavity translates to hole mark in Chinese. It forms in two main ways. Sometimes crystals on the diamond surface fall off naturally. Other times, cutters leave angular gaps and pits during later cutting and polishing works.

Diamonds have a natural feature: they attract oil but repel water. As the customer wears the ring longer and longer, more grease stick to the diamond surface. Those cavity holes easily trap dirt and oil inside. People can hardly clean the hidden grime completely. Over time, the trapped dirt will make the diamond fire look much duller to naked eyes.

Besides that, diamonds with cavity inclusions have worse stability than standard flawless stones. Diamond material own high brittleness. They cannot stand hard hits or accidental drops at all. A cavity acts like a primary wound on the gem. Once the diamond receive a strong impact, cracks may spread along the crystal cleavage lines quickly. It might even cause big breaks in serious cases.

So my advice to this net friend is straightforward. If he can find other alternative diamonds, he’d better skip this piece completely. There are tons of high-quality loose diamonds available on James allen, baluenile and whiteflash platforms. He can pick another stone without cavity flaws to avoid all the hidden troubles in daily wearing.

Categories
4C

Diamond Color

Not all diamonds are worth buying!!!
Both milky tint and brown hue:Tap to see full diamond info
This diamond has milky:Click view detailed diamond information
This diamond has green fluorescence.:View diamond details
This diamond has a cavity:See the diamond details

The color grading rule for diamond in international jewelry industry is really strict. Every country got their own matching evaluate standard. So you can only judge diamond color grade base on loose diamond, and do the test under strict lab environment. If you test a diamond ring with metal setting, the metal will mess up your judge result. Platinum setting can make diamond look more white, but rose gold will make diamond color grade look lower. That’s why you can not get a fair and right color score when the diamond still on the ring mount. Color grade is only one part that decide diamond quality. Don’t just think a I color diamond always looks better than J color one. You need look at the other three C too: diamond cut, clarity grade and carat weight.

Diamond Color Grading

Diamond rings shine so bright on fingers, the secret is loose diamond work like a prism. It catch natural light and break it into many colorful sparkles. The diamond’s own color acts like a light filter inside. If a diamond is clear and no color, it can reflect more bright rainbow flashes. That make colorless diamond more expensive than light yellow ones. Diamond color grade is a rule to mark how yellow a stone is. Higher grade means less yellow tint inside the crystal. Color is one of the four most important C factors. When people pick loose diamonds, they can’t ignore color. Human eyes first notice how shiny a diamond is, and shine level is heavily effected by color.
Grade D: Total no color. It is the top color level, super rare to find.

Grade E: No visible color. Only professional gem tester can find tiny bit of tint inside. This kind of diamond is really uncommon.

Grade F: Colorless grade. Only jewelry experts can spot little color trace, but it still count as colorless range. They are top quality diamonds.

Grade G to H: Near colorless. You can see soft yellow tint only when you put them next to D-F high grade stones. Diamonds of G and H grade still keep great market value.

Grade I to J: Almost no color. Light yellow shade can be detected easily. They have pretty good value for daily wear.

Grade K to M: Strong yellow color, low fire sparkle. Our wedding diamond ring store do not sell these grades, we tell customers do not choose them.

Grade N to Z: Dark yellow tint, bad light performance. Our shop never provide these diamonds, we also advice buyers stay away from them.

Grading color of diamond

Once a diamond finish cutting, outside things can not change its value anymore. Diamond color will not turn yellow as years go by. It is extremely hard to find a full colorless diamond, so D grade stones are rare and costly. Most loose diamonds have natural mixed tint when they form underground, like green, coffee and brown shades. These unwanted color will drop diamond’s worth a lot. Many shoppers ask, which color grade should I pick when buying a diamond? Everyone know the rule: colorless is best, darker yellow means worse quality. D to F are full colorless group. G to J are near colorless. K to M have clear yellow tone. N to Z carry obvious pale yellow, they almost have no collection value. But fun fact, N-Z yellow diamonds match gold metal very nicely. After Z grade, stones with full rich yellow color belong to fancy colored diamond category.
For daily shopping, better choose H or above I color diamonds. I and J grade still fall into near colorless group, but naked eyes can catch faint yellow shade directly. Fancy color diamonds use different grading rule. Their price depend on how bright and vivid their color is. There are many fancy diamond types: yellow, green, blue, brown, pink, orange, red, black, purple and more. All of them are precious fancy gems. Red fancy diamond is the most valuable one among all colored diamonds.
Categories
James Allen

Happy Moments of James Allen Customers (Merged into BlueNile in 2026)

Not all diamonds are worth buying!!!
Both milky tint and brown hue:Tap to see full diamond info
This diamond has milky:Click view detailed diamond information
This diamond has green fluorescence.:View diamond details
This diamond has a cavity:See the diamond details

Latest update: bluenile and jamesallen merge together now. Below are old customer reviews who shopped at jamesallen before.
I first met Isaac nine years ago. At first, we were just regular friends. We lived our seperate lives back then too. We did our own things every day, hang out with different people, and barely had too much deep connection between us. We thought we would only stay as casual friends forever, never imagining fate would pull us close and tie our lives together one day.
Three years passed after we started dating. On March 18, 2017, Isaac pop the big question to me, he proposed to me officially. Before that, we planned a trip to Atlanta to attend his older brother’s wedding. He told me he wanna bring me along so I can meet all his family members properly. His whole family all agreed this trip would be the perfect chance, and they all hoped this trip could turn into an unforgettable memory for me. They secretly made lots of small plans without telling me anything ahead of time. I didn’t notice any strange hints or weird behaviors from anyone in his family at all in those days.

Happy Moments of James Allen Customers (Merged into BlueNile in 2026)  YES

One afternoon during our stay in Atlanta, Isaac said he wanna take me to Piedmont Park for a walk. I thought it’s just a simple casual hike to enjoy the fresh air and nice park views. I put on my light jacket and followed him without thinking twice. We walked along the lake path, chat about small daily stuff as usual, nothing felt out of ordinary. I really believed we only came here for a short relaxing outdoor trip.
When we almost finish our walk and were ready to head back to the car, Isaac suddenly stop walking and turned to face me. He told me there is a important reason why he brought me to this park today, and asked me to turn my head and look behind me. I slowly turned around, and my eyes widen right away. All our close friends and his family members were standing not far away from us. They held big handmade signs up high. The words on the signs read “Nelssy, will you marry me?”.
Right after I saw those words, Isaac drop down on one knee in front of me. My mind went blank for a few seconds. This moment is one of the biggest surprise I ever get in my whole life. I still remember how my hands shake and tears roll down my cheeks immediately. That special proposal moment stay in my heart forever, I love every single second of it more than I can say. Every time I look back on that day, I still feel all the warm and happy feelings rush back to me all over again.
Categories
Brian Gavin Diamond

Limited Time Special Offer: 8% Off 0.70–0.99ct Diamonds Brian Gavin

Not all diamonds are worth buying!!!
Both milky tint and brown hue:Tap to see full diamond info
This diamond has milky:Click view detailed diamond information
This diamond has green fluorescence.:View diamond details
This diamond has a cavity:See the diamond details

Newest Update!

This old discount notice I post here, famous American diamond seller Brian Gavin has a new big promotion recently. He shares a discount up to eight percent for diamonds from 0.70 carat to 0.99 carat. People who know Brian Gavin well all know that their diamonds are famous for great quality. Especially those stones picked by Brian Gavin himself. They got perfect cut, even the ones with fluorescence look really nice. No milky tint, no brown tint, the look shock everyone who see them.
If you are long time subscribe user of Brian Gavin, you can type the promo code VIP1706 online when you check out, then you get the eight percent off price. After you apply the discount, if you still not have enough money right now, you can pick flexible installment plan from three months to twelve months. If you really need a diamond for daily wear, you can think about buy stones from Brian Gavin.
Extra Terms
  1. This Brian Gavin discount end at five o’clock pm, Friday, June 23, 2017.
  2. This offer works for Brian Gavin Signature H&A cut, Princess cut, Cushion cut, Advance cut and blue diamonds. It not fit for Black by Brian Gavin series diamonds.
  3. You cannot use this diamond discount with any other sale price or other coupons together. For customer who pay by wire transfer or check, you can get eight percent off full list price, this number already include the three percent wire transfer discount.
  4. Every order need finish all steps online to get this special offer. Offline purchase will not count.
  5. All wire transfer and check money need arrive Brian Gavin’s account before five pm on June 27, 2017 to lock the discount price. If they get your payment after this time, your diamond price will change back to original full price, no exception.
Categories
Birthstone Jewelry

Ruby

Not all diamonds are worth buying!!!
Both milky tint and brown hue:Tap to see full diamond info
This diamond has milky:Click view detailed diamond information
This diamond has green fluorescence.:View diamond details
This diamond has a cavity:See the diamond details

Ruby is one of the four major precious gems, together with diamond, sapphire and emerald. It is the most popular red jewelry stone and a type of natural corundum. Ruby owns special shine, strong wear resistance and low reserves in nature, so it is extremely valuable. The main chemical makeup of ruby is aluminum oxide. The chromium element inside it create its bright red color. It scores 9 on the Mohs hardness scale, only softer than diamond.
Perfect clear ruby without any flaw is really hard to find, that’s why natural rubies carry high price tags. But making lab created rubies is not a hard work, you can see man-made rubies widely used in many industrial areas. A natural ruby can only hold real collect value if its transparency reach semi-transparent or higher. Those rubies that are semi-transparent to fully opaque are often made into common jewelry, they do not worth much money at all.

Basic Knowledge You Must Learn About Ruby

The word “Ruby” comes from Latin word: ruber, which means red.

Ruby and sapphire belong to the same gem group, they crystallize in trigonal crystal system, people also call this whole family corundum.

The red shade inside rubies all come from chromium elements. Some people make a mistake here, they say the main component is chromium oxide, actually it is aluminum oxide with chromium impurity. The chromium content usually ranges from 0.1 percent to 3 percent.

Ruby ring

The most costly type of ruby shows a pure bright red tone with rich chromium content. People name this top grade pigeon blood red ruby.

It is almost impossible to dig out a ruby with zero inclusions or surface blemishes in the world. Flawless natural rubies cost far more than diamonds of the same carat weight.

Burma produce lots of top quality rubies, stones from this origin always sell for very high prices. Collectors and jewelry lovers chase Burmese rubies crazily all over the global market.
Nearly all natural rubies go through different enhancement treatments to boost their look and durability. This processing method is super common inside the jewelry trade, almost every merchant will do this step before selling rough rubies to customers.

Important Reminders When Buying Ruby Jewelry Online

I want to share a sincere warning to every buyer. If you travel abroad and spot luxury ruby jewelry in tourist scenic spots, do not buy them easily. Nine out of ten gem goods sold there are fake items. One of my friend took a trip to Thailand years ago, he bought a loose ruby stone and set it into a ring later. After professional lab testing, people told him the stone was totally artificial counterfeit.

RubyRuby

If you plan to shop rubies on internet, pick well-known large suppliers first. Two famous platforms are James Allen and Blue Nile. Recently BN and JA merge into one single company, their overall strength become much stronger now. Buying rubies through these official brands can better protect your consumer rights.
Before you place any order, take enough time to read the full gem certificate carefully. Double check if the stone’s shape, carat weight and color match the description listed online. If you still have doubts, send messages to sellers and ask for more specific details. The way staff reply your questions can tell you whether they respect every ordinary customer sincerely.
Also, do not only fix your eyes on ruby size. Larger rubies normally have higher prices, but two other factors decide its value just as important: color saturation and how many inclusions trapped inside the stone. Even a big ruby with pale red tone or full of cracks will not worth a high sum.

Ruby jewelry

Ruby hold a sacred status in the Bible, it is recorded as the most precious gemstone. It also acts as the birthstone for people born in July. Its bright fiery red color stands for energy and vitality. Old beliefs say wearing ruby for a long time can bring happy marriage, smooth life and long healthy years to the owner. European royal families also treat ruby as a necessary jewelry piece in all grand wedding ceremonies.
People use the standard called 1T4C to judge and grade rubies. The letter T short for Transparency, the four Cs represent color, carat weight, cut and clarity. Blue Nile’s colored gem section stocks hundreds of rubies and finished jewelry sets. Every stone page support 360-degree rotating view, so shoppers can check every corner clearly. The color selection range is very wide, you can choose stones from deep pigeon blood red to soft light red at home, no need to visit offline jewelry stores in person.
Categories
Diamond 101

How to Customize Your Wedding Diamond Ring

Not all diamonds are worth buying!!!
Both milky tint and brown hue:Tap to see full diamond info
This diamond has milky:Click view detailed diamond information
This diamond has green fluorescence.:View diamond details
This diamond has a cavity:See the diamond details

As one of the most important milestones in love, a engagement ring stands for that you and your partner are ready to talk about marriage and plan your future life together. Lots of people dream to gift their lovers a stunning diamond engagement ring, but many of them face a tight budget and can not afford fancy rings from offline physical jewelry stores. If this is your situation, customizing a diamond ring online will be a perfect choice for you. There are several well-known online diamond custom brands you can trust, including Blue Nile, James Allen, WhiteFlash and Brian Gavin. It’s worth mentioning that James Allen has merged with Blue Nile and they now belong to the same company, so their diamond supply and after-sales services share many similar resources for customers.

How to Customize Your Own Engagement Ring

The whole custom process does not sound complicated, but you need to follow clear steps to get a ring that fits all your expectations. The first thing you need to do is picture the exact style of diamond ring you want in your mind. Every couple hopes their engagement ring is unique and can not be copied by others, so designing an exclusive style carries great meaning. Next, finding a reputable and experienced jeweler to carry out your custom plan is extremely vital. When you send all your design details to the jeweler you pick, you should describe every single detail as clear as possible. Vague descriptions will make the finished ring far away from your imagination and waste both your time and money.

custom  Diamond Ring

If you lack design inspiration and have no idea what style to pick at the beginning, you can browse thousands of finished ring samples on those online jewelry websites. The platforms offer a flexible matching mode: you can pick a loose diamond first, then match it with any ring band you like freely to build your exclusive ring. After you finish your combination, the website will generate realistic renderings to show how the final ring looks, so you can adjust the style before placing your formal order.

Set Your Budget and Learn About Diamond 4C Standards

Before you lock down any loose diamond, you have to set a clear budget and pick cost-effective stones based on your financial situation. The core factors that decide a diamond’s price are the famous 4C standards. For most ordinary buyers, diamonds with H color grade and excellent cut are the most cost-efficient option. Under naked eyes, these diamonds look totally clean and shiny without obvious yellow tint. Even if two diamonds own identical 4C grades, there are no two diamonds in the whole world that are exactly the same. Tiny natural differences lead to different price tags for stones of equal grades, so you must check every diamond’s detailed report carefully.

Wedding Diamond Ring

You must stay away from milky, coffee and green tinted diamonds by all means, and never buy stones that look dull and non-transparent. For fancy shaped diamonds like oval diamonds, you need to avoid obvious bow-tie effect which ruins the stone’s beauty and light performance. Meanwhile, skip diamonds with cavity inclusions and other flaws that hurt the diamond’s long-term durability. The 4C system directly decides a diamond’s total value, so you need to choose proper 4C levels matching your own demand and wallet. The 4C rules made by GIA make diamond pricing more transparent for global consumers. Confirming your target 4C standards is like finishing the first big step of your full ring customization journey.

Confirm Your Ring Band Size

Once you select your ideal loose diamond, the next task is confirming the perfect finger size for your ring band. Every person has different finger thickness and length, so one size never fits all. You need to measure your accurate finger circumference to get a suitable size. A easy way people often use is wrapping a thin paper strip around their finger to measure, but this homemade method brings big measuring errors easily. The more precise way is heading to offline jewelry stores and let professional staff measure your finger with standard ring sizers. You can visit two or three different shops to double check your size data before submitting your custom request online.

Wedding Diamond weeding Ring

Besides the size, you also need to pick a proper band width and band style. If the ring band is too tight, it will block blood circulation in your finger and bring constant discomfort. If the band is too loose, the diamond ring may slip off your finger accidentally and get lost easily, which is a terrible loss for any lover.

Choose Your Favorite Ring Band Style

Ring band styles change the whole visual effect of your diamond ring greatly, so you can pick styles based on your personal taste or the shape of your fingers. The market holds countless ring designs with totally different features. Physical shopping malls display many diamond rings, but most of their styles are old-fashioned and out of date. Online custom brands launch much newer, more creative styles for customers to choose. Still, remember the most fancy design means nothing if it does not suit you—only the style that matches you perfectly is the best choice.
You also need to make a decision on stone setting types according to your preference. Some people love simple minimalist designs, such as four-prong setting and six-prong setting, which highlight the central diamond fully without extra decoration. Other buyers prefer luxurious layouts, including cluster setting and halo setting surrounded by small side diamonds to boost the ring’s sparkle.

Free Inner Ring Engraving Service

Nowadays, personalized details become more and more popular in custom diamond rings. Many online jewelers such as James Allen and Blue Nile provide free engraving service for their customers. You can carve meaningful words, special dates, initials or lucky numbers on the inner wall of your ring band. Every time you take a glance at the hidden carving on your ring, warm happy feelings will fill your heart and remind you of your sweet love memories.
After you finish all these preparation steps one by one, you just need to wait patiently for your beautiful custom diamond ring to be manufactured and delivered to your home. When you receive the package and put the ring on your finger, all the time you spend on planning and customizing will feel totally worthwhile.
Categories
James Allen

Customer Reviews of James Allen Diamond Rings (now merged into Blue Nile)

Not all diamonds are worth buying!!!
Both milky tint and brown hue:Tap to see full diamond info
This diamond has milky:Click view detailed diamond information
This diamond has green fluorescence.:View diamond details
This diamond has a cavity:See the diamond details

Newest Update!

James Allen and Blue Nile have merged into one brand. These are all old customer reviews left by people who shopped at James Allen before. Now all those old customers can also use all services on the official Blue Nile website.
Johnny and Runxi are a stylish couple in everyone’s eyes. They met each other through a dating app. Today technology becomes so advanced, it makes people connect with each other much easier. They chatted with each other on this mobile app for a long time. They both thought meeting face to face on a snowy night would be super fun.

Reviews of James Allen

They met for the very first time on the weekend right after Valentine’s Day in 2015. Johnny was late for the date. Runxi got really mad at him. But Johnny told her he would treat her to a fancy big dinner to make up for his mistake. Then she thought to herself, why not take this free nice meal?
This first meet-up was not perfect at all. It was not that love-at-first-sight story people always talk about. Still, neither of them disliked the other person. Johnny was cute, charming and full of fun things to say. They talked together until really late at night. After that, Johnny drove her back to her home.
Eight months went by quickly. Runxi went to James Allen and picked out a beautiful one-carat oval diamond ring, and made it custom just for herself.

James Allen now merged into Blue Nile

Johnny held blue roses in one hand, and the diamond ring in his other hand. He proposed to Runxi formally inside their apartment in New York. The whole proposal went perfectly without any trouble.
Johnny and Runxi got married at New York City Hall on December 15, 2015. From that day on, they live a happy life together.
Whenever I feel upset and life feels tough, I will look down at my left hand first. This diamond ring always reminds me how wonderful life can be. Wearing this ring brings me such warm and great feelings. I am so thankful that James Allen and Blue Nile become a important part of my happy life.
Categories
Blue Nile

Blue Nile Hong Kong promo code & self-pickup address

Not all diamonds are worth buying!!!
Both milky tint and brown hue:Tap to see full diamond info
This diamond has milky:Click view detailed diamond information
This diamond has green fluorescence.:View diamond details
This diamond has a cavity:See the diamond details

If you’re planning to buy diamonds from Blue Nile Hong Kong recently, there’s a great limited-time offer waiting for you. Spend over $2,500 USD sitewide and you’ll get a $150 discount automatically. Orders ranging from $500 to $2,499 USD can enjoy a $50 rebate instead. This coupon works for most jewelry and diamond rings, only marked-down sale items are excluded. Redeeming the offer is straightforward: just enter the promo code in the designated box and hit apply to claim your savings. This discount won’t last forever, so anyone shopping for engagement rings should act fast before it expires.
Mainland China customers also have a separate exclusive deal. Orders totaling more than 8,000 RMB qualify for an 800 RMB discount, equivalent to a solid 10% off. Simply add your selected pieces to the cart, input the corresponding promo code, and the price will adjust right away.

Blue Nile Hong Kong promo code

There are important terms to remember. All promo codes expire on December 28 this year. Vouchers, Custom Created Diamond Jewelry™, pre-set engagement rings, cleaning supplies and sale goods cannot use this discount. It cannot stack with any other promotions or rebates, and it won’t apply retroactively to past purchases. Blue Nile reserves the right to revise these terms without advance notice, and additional restrictions may apply without prior warning.
Three official UPS self-pickup locations are available for Blue Nile Hong Kong orders:
  1. UPS Parcel Pro Office: Units 1105-1106, 11/F, Tower A, Hung Hom Commercial Centre, 39 Ma Tau Wai Road, Hung Hom, Kowloon. Opening hours: Monday–Friday 9:00–18:00, Saturday 9:00–13:30.
  2. UPS KBCC Center: Basement, Sunshine Kowloon Bay Cargo Center, 59 Tai Yip Street, Kowloon Bay. Opening hours: Monday–Friday 11:00–20:00, Saturday 11:00–19:00.
  3. UPS Lai Chi Kok Service Center: Ground Floor, Manley Tower, 828 Cheung Sha Wan Road, Kowloon. Opening hours: Monday–Friday 09:30–19:30, Saturday 09:30–18:00.
Categories
4C Diamond 101

Diamond Weight Unit – Carat

Not all diamonds are worth buying!!!
Both milky tint and brown hue:Tap to see full diamond info
This diamond has milky:Click view detailed diamond information
This diamond has green fluorescence.:View diamond details
This diamond has a cavity:See the diamond details

Diamond Carat: What You Need to Know

Carat is a unit used to measure the weight of gemstones. One carat equals 0.2 grams. The weight unit for gems has changed a lot over time. Since 1913, the whole world has followed the same rule: one carat is one-fifth of a gram.
For small diamonds, one carat is split into 100 points. A 40-point diamond means it is 0.4 carats. Diamonds that weigh more than one carat are much fewer than those below one carat. This is why larger diamonds are more rare and valuable. As one of the four key C factors, carat weight greatly affects a diamond’s price.
Diamonds come in all sizes, from just a few points to dozens of carats. Their distribution is like a pyramid. Diamonds with excellent 4C grades stay at the very top of the pyramid. Here is a simple example. A single 2-carat diamond costs more than two 1-carat diamonds of the same quality. Big diamonds with top-tier cut, color and clarity are really hard to find. One carat is equal to 200 milligrams, and also 100 points.

diamond carat

Carat is the standard weight for diamonds and many other gemstones. It is just like how one dollar has one hundred pennies. A 50-point diamond is 0.50 carats. Two diamonds with the same carat weight can have totally different prices. This big gap comes from their cut, color and clarity. Most diamonds made into fine jewelry are less than one carat. A 1-carat diamond weighs about the same as a paper clip. The higher a diamond’s grade, the stronger the influence of weight on its price.

How Important is Diamond Carat Measurement?

A tiny difference in diamond weight can lead to a huge difference in price. This situation is even more obvious when the weight hits a full carat number. That is why accurate measurement is so important.
In ancient times, different countries used different measuring standards. Back then, one carat was about 205.3 milligrams. To turn it into today’s standard, you need to multiply the old number by 1.0265. The metric carat was officially used worldwide from 1913. Now one carat is fixed at 200 milligrams. People no longer need to do difficult conversions.

carat chart

On official diamond grading reports, the weight is usually recorded to three decimal places. The IGI, International Gemological Institute, uses high-precision electronic scales. Its accuracy can reach 0.00001 carats to get the exact weight of each diamond.

What Carat Size Should You Choose When Buying a Diamond?

Two main things you need to think about first: your finger size and your budget. If you love big diamonds but do not have much money, you should put cut quality in the first place.
Diamonds have carat premium, which means prices rise sharply at full carat marks. Never pick a bigger diamond with a poor cut. A good cut brings out brilliant sparkle and fire in a diamond.
You can also choose diamonds in I-J color grade with no visible flaws to the naked eye. The color difference in this range is hard to notice when you look at the diamond face up. Before you make a purchase, learn well about diamond carat knowledge. It will help you pick out the most suitable diamond for yourself.
Categories
Diamond Q&A

Blue Nile GIA Certified Diamond Advice

Not all diamonds are worth buying!!!
Both milky tint and brown hue:Tap to see full diamond info
This diamond has milky:Click view detailed diamond information
This diamond has green fluorescence.:View diamond details
This diamond has a cavity:See the diamond details

Dialogue Between Diamond Inquirer & Diamond Consultant (ijadiamond)

Inquirer:

Hello there! I’d like to ask for your professional advice on two diamonds with distinct GIA certificate numbers of Blue nile: 7248194256 and 2257776455. Which one is the superior option overall? Besides, the diamond graded G color costs roughly an extra 600 US dollars compared to the H-color alternative. Also, should I only pick loose diamonds with zero fluorescence when purchasing unmounted stones?

ijadiamond:

I would recommend going for the diamond numbered 2257776455 without hesitation. Let me break down the flaws of the other stone for your reference. The diamond with serial number 7248194256 suffers from subpar cut quality, paired with a noticeably smaller girdle diameter. Visually, it fails to deliver a prominent, eye-catching presence when viewed with the naked eye. Theoretically speaking, its light performance and fire—the dazzling rainbow sparkle diamonds produce—will be noticeably weaker, making it far less cost-effective in contrast to the other option.
As for color grading differences, I suggest visiting physical jewelry stores to observe diamonds in natural daylight for comparison. From my practical experience, the visual gap between G and H color is barely distinguishable under natural light. For any diamond ranked H color or higher with no visible yellow tint, I strongly advise selecting a stone classified as non-fluorescent. Fluorescence can cloud a diamond’s clarity and brilliance under certain lighting conditions, so eliminating this factor avoids unexpected dullness.

Inquirer:

I’ve checked Blue Nile’s ring setting collections, and their design options feel quite limited. It took me ages to find one style I genuinely love, yet most of their bands are crafted from 14-karat gold. Could you also walk me through reliable ways to verify a diamond’s authenticity?

ijadiamond:

You’re absolutely right about Blue Nile’s aesthetic leanings; their ring styles are tailored primarily for Western consumers’ tastes. In terms of material durability, 14K gold is harder and more rigid than 18K gold, which translates to tighter, more secure stone setting that resists loosening over time. By contrast, most ring mounts available in Hong Kong jewelry shops use 18K gold, which contains a higher pure gold content for richer color and softer texture.
Every certified GIA diamond features a unique laser-inscribed serial number etched onto its girdle, matching the code printed on its corresponding GIA certificate. Even non-professional buyers can view this microscopic marking using a 20x magnifying loupe. This laser engraving acts as the diamond’s exclusive identification tag, serving as a primary authenticity check. For full, authoritative confirmation, you may also submit the stone to a certified third-party gemstone quality inspection laboratory for formal testing.

diamond advice

Inquirer:

Thank you so much for the detailed guidance! Could you share how to systematically pick a high-quality loose diamond?

ijadiamond:

The widely circulated strict diamond selection metrics online can act as valuable reference benchmarks, though they should not be treated as absolute rigid rules. Below are the standard acceptable ranges and tighter premium screening thresholds for key cutting parameters:
  1. Total Depth Percentage: Standard range 57.5%–63%; Premium selection window 60%–62%
  2. Table Percentage: Standard range 52%–62%; Premium selection window 55%–58%
  3. Crown Angle: Standard range 31.5°–36.5°; Premium selection window 34°–35°
  4. Crown Height Percentage: Standard range 12.5%–17%; Premium selection window 14%–16%
  5. Pavilion Angle: Standard range 40.4°–41.8°; Premium selection window 40.5°–41°
  6. Pavilion Depth Percentage: Standard range 42.5%–44.5%; Premium selection window 42.5%–43.5%
  7. Star Facet Length Percentage: Standard range 45%–65%; Premium selection window 55%–60%
  8. Lower Girdle Facet Percentage: Standard range 70%–85%; Premium selection window 70%–75%
  9. Girdle Thickness: Six official grades—Thin, Thin to Medium, Thin to Slightly Thick, Medium, Medium to Slightly Thick, Slightly Thick. Premium picks are limited to Thin to Medium, Medium, and Medium to Slightly Thick.
If you want to simulate and evaluate a diamond’s fire and light performance digitally, you can use this professional online HCA testing tool: https://www.pricescope.com/tools/hca

GIA diamond

Inquirer:

I followed the premium cut standards you shared to shortlist a diamond that I believe boasts excellent overall quality. Its GIA certificate ID is 7216278249. I ran the stone through the HCA test link you provided, and the generated score indicates outstanding light performance. Would you mind giving a second opinion on whether this diamond is a worthy purchase?

ijadiamond:

This diamond performs excellently across all critical cut, color, clarity and light performance metrics; it is a fantastic choice.

Inquirer:

Great, I will settle on this diamond then. I really appreciate all your patient advice!