Every estimate starts from the RAPAPORT DIAMOND REPORT for round stones, dated July 3, 2026. Your stone's carat weight picks a table, and its colour and clarity pick a cell in that table, giving a list price per carat.
The Rapaport sheet is a high asking price, not a transaction price. Stones almost always change hands below it. The slider sets how far below, and 30% is a common starting point — move it to match what you actually see in your market.
They nudge the list price to reflect finish and fluorescence, which the sheet does not price separately. Those percentages are our own estimates of usual trade behaviour, not published Rapaport data, and each one is shown in the breakdown so you can see exactly what was applied.
No. Treat it as a starting point for a conversation. A working dealer prices against a licensed current list plus their own trade data, and against the individual stone — two diamonds with identical grades can trade well apart.
Only roughly. This build carries the Round Brilliant sheet, and fancy shapes trade off their own lists. For a non-round stone we apply an estimated spread against the round list and flag it on the result.
It is sent to our server, read once to pull out the grades, and not retained. Saved estimates keep only the graded values and the calculated figures.
It reads clear, well-lit reports well, but it can misread a blurry photo. Anything it cannot read confidently is left blank for you to fill in. Always check the values against the paper before trusting the number.