Category: Diamond Q&A

A customer sent over details of a diamond listed on Blue Nile and asked whether it was a worthwhile purchase. Let’s break down all its pros and cons step by step.

First, let’s go through its basic clarity grade. This stone is graded SI1. At first glance, SI1 can be a budget-friendly choice if the inclusions are tiny, few, and hidden out of sight. Its only listed inclusion type is feather, which sounds better than diamonds packed with dark mineral spots. Black crystals easily make a stone look dirty to the naked eye, while feathers only create faint white lines under light. This single inclusion type is its only small advantage, yet every other feature pulls its value down sharply.

The biggest safety flaw comes from the distribution of feathers. Many short feathers cluster all around the girdle. The girdle is the thinnest part of a diamond and bears constant pressure in daily wear. Prongs squeeze the girdle during setting, and small knocks against tables, walls or jewelry boxes hit this area often. Multiple feathers along the edge create dozens of weak stress points. Even light impact can stretch these cracks wider over time. If any of these girdle feathers reach the surface, the risk of chipping or splitting rises drastically. Repairs for cracked diamonds cost a lot, and severe splits ruin the stone permanently.

Second, there is one long feather in the pavilion that crosses two separate pavilion facets. The pavilion controls most of a diamond’s sparkle and light reflection. A long feather running across two facets forms a visible pale white streak when exposed to natural or indoor light. It blocks light travel inside the gem, cutting down brilliance and fire. Unlike tiny isolated feathers hidden at the culet, this extended crack covers a large reflective zone. Structurally, long cross-facet cracks transfer internal stress easily. A single hard bump may make the fracture spread deeper into the stone.

Another hidden problem sits in the certificate comment: clouds are not shown. This line means countless tiny cloud inclusions fill the diamond, and there are too many to mark on the clarity plot diagram. Clouds create a foggy, milky appearance inside diamonds. Instead of clear, crisp flashes of light, a stone with heavy clouds looks dull and hazy. This cloud mass is one key reason the diamond only reaches SI1 clarity; without these dense clouds, it would likely qualify for VS clarity. The white glow from feathers mixes with the milky haze from clouds, making the diamond look far less transparent than cleaner SI1 alternatives at the same price.

Now we weigh practical use and resale value. For daily-worn engagement rings or everyday jewelry, this stone is not reliable. Most buyers wear their rings nonstop while cooking, cleaning or moving around, which raises the chance of bumps and pressure. The combination of girdle feathers and a long pavilion crack makes it fragile. When it comes to resale, dealers strongly avoid stones with multiple feathers and heavy cloud coverage. Such diamonds lose far more value during trade-in than stones with minor, hidden inclusions.

This diamond only barely works under two strict conditions. First, its price has to be at least 20 percent lower than comparable SI1 diamonds with clean inclusions. Second, the buyer plans to lock it in full bezel setting and wear it rarely, mainly for collection rather than daily use. For anyone looking for a durable, bright ring for regular wear, this option is not worth the investment.

A better standard for a good SI1 diamond on Blue Nile is clear. It should have one short internal feather away from the girdle, no cross-facet fractures, minimal tiny pinpoint inclusions, and no notes about unplotted clouds on the certificate. The clarity plot should show few marks, none touching the diamond’s outer edge. All in all, the layered flaws of clustered girdle feathers, a long pavilion cross-facet feather, and hidden dense clouds make this diamond a risky, low-sparkle pick that we do not recommend purchasing for daily wear.

A reader sent me details of a 1.51-carat diamond listed on Blue Nile and asked whether it was worth buying. Below is its GIA certificate for reference. This stone weighs 1.51 carats with H color and SI1 clarity, featuring a perfect Triple Excellent cut and well-balanced proportions. Its 59% table percentage delivers outstanding brightness and sparkle. However, there is a prominent knot inclusion right at the center of the table, which is a critical drawback. Let’s break down the pros and cons of this diamond in detail.

Generally speaking, this 1.51-carat SI1 diamond with a prominent knot right on its table surface is not a wise pick, especially for an engagement ring. To begin with, a knot is classified as a serious internal inclusion formed by intergrown diamond crystals inside the stone. Its hardness differs from the surrounding diamond lattice, which creates hidden structural weaknesses and raises the risk of natural cracking under daily wear or minor impact. Worse still, this large knot sits at the center of the table, the most visible part of the diamond. When light hits the stone, the inclusion will appear as an obvious dark spot to the naked eye, ruining the stone’s transparency and brilliance and greatly diminishing its sparkling performance.

Although the diamond is graded SI1, this clarity grade only guarantees invisible blemishes on the condition that inclusions are tiny and placed near the girdle or pavilion. A noticeable central knot breaks this basic standard, making it one of the worst specimens within the SI1 range with poor overall value. At 1.5 carats, the diamond has a broad table area that magnifies every flaw, so the central knot will stand out prominently in daily use. It also suffers terrible resale value, as buyers will reject stones with obvious central inclusions during trade-in or resale.

The only acceptable scenario to consider this diamond is if you have an extremely tight budget, prioritize carat weight over visual beauty, and have no plans to resell or upgrade the stone in the future.

For most shoppers seeking a stunning, durable and retainable engagement diamond, try to opt for another SI1 stone with minor edge inclusions and no knots, or slightly raise your budget for a VS2 diamond with clean, unnoticeable internal features. Blue Nile carries a huge selection of high-quality loose diamonds with new stock refreshed on a regular basis. If you take time to browse its inventory frequently, you will constantly come across newly uploaded stones with cleaner clarity and superior cut performance. There is no need to settle for flawed options like the diamond we just discussed; with consistent updates, you can always find a far better diamond that matches your standards and budget, reach out to us to read more Blue Nile diamond reviews.

Inquirer: Hello, I’m planning to buy a loose round diamond from Blue Nile, and my budget is around 1,500 US dollars. I’m a total beginner with zero professional knowledge about diamonds, so I have no idea how to strike a proper balance among the four core diamond grading criteria, the 4Cs. One clear priority I have is that the diamond should not show an obvious yellow tint to the naked eye. I’d really appreciate it if you could offer me some targeted purchasing advice based on my limited budget and basic demand. Thank you so much in advance for your guidance.

Ijadiamond: Hi there, I’d recommend H color diamonds for you as they deliver outstanding cost performance with barely noticeable yellow undertones. When viewed with the naked eye, their visual appearance matches perfectly with H-color diamonds displayed in physical jewelry malls. You can visit offline jewelry stores to examine real H-color diamonds in person to help yourself decide whether this shade fits your aesthetic preference. As the old saying goes, scarcity boosts value; diamonds grow rarer as their carat weight increases. With your 1,500-dollar budget, you can afford a 0.70-carat diamond graded VVS in clarity, which will be completely eye-clean without any visible blemishes to ordinary observers.

I’ve shortlisted two round loose diamonds with superior cut quality and great value for money for your reference. Blue Nile provides highly detailed, crystal-clear real-shot videos and images of each loose diamond on its official website, which you can carefully review to inspect surface details. Before placing any order, remember to double-check whether the stone is fully eye-clean. You should also confirm it is free of milky or brown tint defects, commonly known as milk diamonds and coffee diamonds, which severely ruin a diamond’s sparkle and transparency. The two diamond links I mentioned are https://www.bluenile.com/hk/zh/diamond-details/LD08502199 and GIA 0.71 Carat H-VVS2 Excellent Cut Round Diamondrespectively. Unfortunately, the second link leads to an anti-bot verification page right now, so you may not access its diamond details temporarily.

Inquirer: Many thanks for your thoughtful and thorough suggestions. After comparing the two options you shared, I’ve made up my mind to go with the first diamond listed on Blue Nile.

Ijadiamond: You’re very welcome. Feel free to reach out if you have any other questions about diamond selection or order procedures later on.

Hello there! The content you shared is really useful. I have a question for you. Which shape of diamonds from Blue Nile has the best fire? And which one looks the shiniest after being set into jewelry?

Could you recommend a 1 carat white round diamond for me? I do not have strict rules on color, clarity or cut grades. But the stone must have no visible tint or flaws to the naked eye. I hope its reflection, sparkle and fire can be as great as possible. Also, I want the diamond to look larger on the ring after setting. My budget is within 3000 US dollars, and I can spend a little more if I find a really good piece. Thanks a lot!

Alright, thank you so much for your advice and help. I finally pick the diamond from Blue Nile.