First thanks for this great ressource! I believe I may have found a bug, or am I just holding it wrong?

I recently was looking at a diamond, SKU 11039206. I found it on the efficient frontier in the “Diamond Prices” tab. I did make sure to select the Ideal proportions filter. The diamond appears on the curve as a brown square (which, IIUC means “ideal proportions”).

I then went to James Allen and asked for the certificate of that diamond. It mentions: Table: 57.5%, Crown angle: 36.4°, Pavillon: 40.1°.

According to the Cut estimator, this is “AGS Excellent/GIA Very Good”, which is quite far from “Ideal”. Is it a bug, or did I just misunderstand what “Ideal Proportion” means?

Thanks in advance for your help!

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