Cut Score
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How sparkly will your diamond look in person? Our cut score uses each diamond’s unique dimensions to determine just how perfectly it’s cut (and how well it will reflect light).

Cut score is based on a 10-point scale and we typically recommend looking for round diamonds that score a 7.5 or better.

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Fair Price Estimate
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Like a Zillow Zestimate for your diamond. Our Fair Price Estimate is updated daily based on live diamond prices from top online jewelers. Please keep in mind that every diamond is unique and some real-life diamond prices will differ meaningfully from our fair price estimate.

This fair price estimate is not an offer to buy or sell this diamond.

Visual Carat
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StoneAlgo developed our Visual Carat metric to help you understand whether your diamond looks larger or smaller than its actual carat weight implies.

For example, a 1 carat diamond could have a Visual Carat of 1.05 (meaning it looks like your average 1.05 carat diamond) or a smaller Visual Carat like 0.95 (meaning it looks like a 0.95 carat diamond when viewed from above).

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Length-to-Width Ratio
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Length-to-width ratio is calculated by dividing the widest part of the diamond by the narrowest part. A length-to-width ratio of 1.00 would be a perfect circle or square. As the ratio rises above 1 the diamond will begin to look more oval or rectangular. For round diamonds you should shoot for a ratio as close to 1.00 as possible and for fancy shapes it really boils down to a matter of preference.

Lab Grown
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Lab Grown diamonds, also known as man-made diamonds or simply “lab diamonds”, are grown in a highly controlled environment that seeks to replicate the growing process that occurred in nature billions of years ago to create "natural" diamonds.

Lab grown diamonds have a number of benefits which you can read about here.

Search all Lab Grown

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GIA ID 2173920022 | Off Market

0.85 Carat Round Cut Diamond
Diamond Details
Shape
Round
Carat
0.85
Color
D
Clarity
VS1
Fair Price
Cut Score
/ 10
Visual Carat
View Cert.

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Meet StoneAlgo

StoneAlgo began with a simple mission: bring transparency to diamond shopping. Today, we're the largest diamond marketplace in the world with 1,636,204 diamonds from top-rated jewelers like Blue Nile, Brilliance, With Clarity and more.

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Diamond Certificate Details

We Get Granular

Not all GIA excellent cut diamonds are created equal, so we built a scoring system that identifies the best and worst cut diamonds.

The best round cut diamonds will exhibit a clearly defined pattern of 8 black arrows extending outward from the center when viewed from above and tend to have a tight, circular spot in the center.

Poorly cut round diamonds will not have a clearly defined pattern of black arrows and the circular spot in the center is usually much larger.

Move the slider to see the difference between a 9.6 cut score and a 6.0 cut score diamond. Both diamonds are GIA excellent cut with excellent polish and symmetry. We typically recommend diamonds with cut scores of 7.5 or higher.

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Visual Carat Weight
Know Your Visual Appearance

We've created the Visual Carat weight metric to describe how large a diamond actually appears when viewed from above. The visual carat is calculated by measuring a diamond’s surface area and comparing this measurement to the expected surface area for different carat sizes of the same diamond shape.

What is not always made clear is that carat (the most common measure for 'size' when it comes to diamonds) is not a measure of surface area but rather a measure of weight.

While it may seem like we are recommending that you find the lowest depth percentage diamonds, this is definitely not the case. A diamond’s dimensions need to be balanced in order for the stone to display optimal light performance. For round diamonds we calculate this using our cut score and for fancy shapes there are general rules of thumb that can be used. If a diamond is too shallow, the diamond won’t return light properly and we’d recommend against buying the diamond even if it appears much larger than its actual carat size.

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