FAQ

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Why can’t I evaluate a diamond 3 carats or larger?

 

In short, there is too much variation in price and too few data points to draw from over the 3 carat limit. The accuracy of our price prediction algorithm depends on 1) how many data points we can draw from to create our model, and 2) the amount of variation within those data points. There are simply too few diamonds above 3 carats, and the prices vary far too much to create an accurate model.

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What about other parameters? Why don’t you take into account things like fluorescence, table thickness, depth, and girdle?

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We’ve tried creating models both with and without these variables. What we’ve found is that compared to the effects of the 4 C’s (carat, color, cut, clarity), other factors have a minimal impact on price. More specifically, there’s a less than 2% improvement in the accuracy of our model using all those additional variables compared to without.

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Why do you only evaluate GIA diamonds?

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There are many other diamond certification labs such as AGS, EGL, IGI, etc, but GIA is the most widely used and respected. Other labs often have looser standards and are not nearly as reliable.

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How does your algorithm work?

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We started with a database of over 60,000 commercially listed diamonds online, and created a model that uses a variety of factors to predict price. Using complex statistical analysis software, our algorithm attempts to minimize the difference between observed (listed) price and predicted price of our algorithm. By comparing your diamond to our large database, we can help you find how much your diamond should cost.