Fair Price Estimate

This is the price our algorithm believes is fair for this category of diamond. A good way to use this algorithm price is as a target for the price you eventually pay. If the price you pay is below our algorithm price then even better!

We use a Cut Score of 8.0 and Fluorescence of None when calculating this algorithmic price. So keep this in mind when you're comparing to an actual diamond below. If you are looking at a more broad category, for example. 1 carat G color, then we'll average together all the algorithmic prices for each clarity to give you a general idea of the price.

Similar Diamonds

Thinking about stepping up or down in Color or Clarity? These links give you an easy way to get there based on your current position. A lot of the time you are able to find your ideal diamond by changing one input slightly to find an amazing deal.

These diamond categories provide a great snapshot of the prices you should be expecting to pay based on our fair price estimates and the diamonds StoneAlgo is currently showing from our trusted online jewelers.

StoneAlgo's Fair Price Estimate

This is the price our algorithm believes is fair for this diamond. A good way to use this algorithm price is as a target for the price you eventually pay. If the price you pay is below our algorithm price then even better!

Since you provided us with a GIA ID we were able to take into account all the details of this diamond including inputs like angles, dimensions and GIA certificate comments when running the diamond through our algorithm.

StoneAlgo's Fair Price Estimate

This is the price our algorithm believes is fair for this diamond. A good way to use this algorithm price is as a target for the price you eventually pay. If the price you pay is below our algorithm price then even better!

When entering the inputs manually we use a Cut Score of 8.0 (out of 10) and assume no negative comments on the GIA certificate.

Great News

It looks like this exact diamond is listed at one of our trusted online jewelers. If you found this diamond elsewhere this is nothing to worry about. A lot of times a single diamond is listed for sale at multiple locations (occasionally even both online and in a store).

We have custom reviews for each jeweler so you can familiarize yourself with everything they have to offer.

Not Found on StonAlgo
This diamond isn't currently being shown by StoneAlgo. Either it is not in one of our trusted online jewelers' inventory or we are still analyzing it and it will be added soon. No need to worry though, you can still use our fair price estimate if you're negotiating elsewhere.
The More You Know...

Now that you've got an idea of the fair price estimate for this type of diamond you can check out our curated list of recommendations for similar diamonds below.

Not quite satisfied yet? Check out more price data at the link provided (there is a heatmap of prices there that we here at StoneAlgo probably like a little bit too much.)

Price History

This chart shows the average price each day for all the diamonds our algorithm believes are great deals in this diamond category. Hover over the chart to see the exact dates and prices.

Diamond prices can fluctuate quite a bit from day to day and this chart will provide a good indication of what live prices you are able to get online and how that number has changed over time.

Prices Heatmap

Since you are on a page dedicated to a single Shape and Carat size we figured it would be useful to look at the predicted price of each Color and Clarity combination to see how stepping in any direction impacts the price.

The pattern is pretty clear from the heatmap (darker blue in the bottom left and lighter blue in the top right). We like to use this type of visualization to inform any decisions on stepping up/down in Color and Clarity.

Diamond Carat

A diamond’s weight is measured in a special unit known as a carat (not to be confused with the karat measurement of gold purity – like 24 karat gold). Two diamonds with the same carat weight can appear to be different sizes based on their cut quality. For reference one carat weighs 2 grams.

Visual Carat

Our visual carat calculation helps translate the surface area of a diamond into a carat size equivalent, showing you how large the diamond will appear based on its specific dimensions. This calculation is specific to the diamond shape you’re looking at. You may be able to unlock additional value by finding a diamond that appears larger than its actual carat weight, but cut quality begins to deteriorate at a certain point as the diamond is cut to maximize surface area over sparkle.


This is the algorithm that started it all. Our Smart Score (formerly known as Savings %) is shown for diamonds that we’ve identified as underpriced. The Smart Score is calculated by comparing each diamond’s actual price to our fair price estimate for the stone. If you don’t see a Smart Score it’s because the diamond isn’t underpriced, but sometimes a diamond is so perfect that you should still consider it even if it is priced slightly higher than our fair price estimate.

Length-to-Width Ratio

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.


Diamond color grades range from D for the “whitest” diamonds to Z for diamonds that have a heavy colored tint to them (usually yellow or brown). We only carry colorless (D – F), near colorless (G – J), and K color diamonds since these are the only color grades we’d recommend purchasing (Tiffany & Co. shows D – I if you want to be a bit more stringent).

Fun fact, the color grading system starts at D because prior to the GIA there was another grading agency that graded color on a scale from A to C (with pluses and minuses like your school report card) so the GIA decided to mix things up and start at D. The more you know…


The clarity grades give you a high level idea of how many inclusions (imperfections) a diamond contains. Diamonds that have no inclusions whatsoever are known as “Flawless”, but the human eye usually can’t tell the difference between a perfect diamond and one with small inclusions (diamonds are really tiny, even though the awesome HD images you’re seeing on StoneAlgo are not). This is usually the area where shoppers need the most help, so please send us a chat or an e-mail if you need a second set of eyes!


Some diamonds have a fluorescent property that glows blue when exposed to UV light. A little fluorescence can actually be a good thing, especially for diamonds with lower color grades as it can offset some of the natural color in the stone. However, if this affect is too strong it can make the diamond appear hazy or “oily” so we don’t typically recommend buying diamonds that have a Very Strong fluorescence grade.


The GIA currently only grades the cut quality of round cut diamonds (though many websites show fancy cut stones as having cut grades – purely a marketing play there). The cut quality really gives you and idea of how “sparkly” the diamond will appear. We recommend Excellent cut diamonds but we also look for Very Good cut diamonds that have a high cut score (above 7.5 preferably). We also try to avoid excellent cut diamonds that have a lower cut score since they typically aren’t as sparkly.

Cut Score

Cut Score is one of our internal calculations that you’ll only find on StoneAlgo and it’s only relevant for round diamonds. We noticed a huge disparity between the best and worst GIA Excellent cut diamonds so we created a mathematical model that gives you a better idea of just how well cut a round diamond is based on all of the specs on its GIA certificate (table %, depth %, pavilion angle, crown angle, etc.). We’d recommend looking for diamonds with Cut Scores of 7.5 or higher.


After a diamond is cut it is polished to help smooth the diamonds surface and deliver even more sparkle. We recommend considering Excellent or Very Good polish grades.


Symmetry measures how consistently the diamond was cut. For example, you don’t want larger facets on one side of the diamond and smaller ones on the other. We recommend considering Excellent or Very Good symmetry grades.


This is the actual price for the diamond at one of our trusted online jewelers, not to be confused with our Fair Price Estimate which is our own calculation of a fair price based on the over 1 million diamonds we’ve studied available from top online jewelers.

Fair Price Estimate

Fair Price Estimate is our own calculation of fair price. It’s what you’d expect to pay for a diamond like this one at a top online jeweler based on today's live prices. We’ve studied over 1 million diamonds (and over 100 million diamond prices) to make this as accurate as possible.

Price Alert

Diamond prices fluctuate daily and we want to make sure you’re the first to know. Set a price alert and we’ll send you an automated e-mail if your diamond drops below the price level you set.


Favorite a diamond and we’ll add it to your Vault. It’s an easy way to track and manage the diamonds you’re researching in a customized dashboard.


This is the unique identifier that the Gemological Institute of America applies to each diamond they grade. This ID is often laser inscribed on the diamond's girdle and can be seen only under high magnification.


If your diamond is available from one of the top online jewelers we work with, it will be noted here with a link to see at the online jeweler.


Want even more info or advice on your specific diamonds? Click this link or keep scrolling down, we wrote you an algorithmic analysis of your diamond based on what we know about it. If we identified any red flags you'll see them explained in this section.

Also, you'll be able to set price alerts and see price history if it is a diamond we currently have from one of our top online jewelers.

0.9 Carat Oval Cut Diamond Prices

Prices Heatmap
Price History

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    Cut Score (Algo)
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