This pre-auction analysis will focus on visual elements and other observations that are not expressed on the GIA report nor in the catalog. Our analysis expresses characteristics such as Undertone, Color Dispersion, and Inner-Grade (UDI). We use grades 1, 2, 3, and 4 (grade 1 is the lowest grade).

The grade 4+ is granted in rare cases and stands for an exceptional characteristic. Stones that receive a total UDI score of 8 or above (SI1 or better) are considered to be gems and are probably suitable for high-end jewelry, collectors, and the investment community.

For your convenience we added the direct links for the GIA reports and for the FCRF Rarity reports.

All images in this article review were taken with an iPhone 7.

All auction valuations are per carat and in US Dollars.


Lot # 2032

9.05 carats fancy vivid yellow Emerald cut, VVS1

High catalog estimation: $ 213,255 per carat

Price Realized: $179,750 per carat

As we mentioned in the opening very few fancy color diamonds carry an outstanding characteristic that entitles them to a  grade of 4+, even fewer of these stones are accompanied by other supporting high grades. ...