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 have added 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.


Christie’s Magnificent Jewels 14 November 2017, Geneva


Lot #460

9.17 carat fancy intense pink pear, SI1

High estimation: $491,241 per carat

Price Realized: $569,721 per carat

A fancy intense pink old mine pear shape cut with a very noticeable black inclusion underneath the crown and a penetrating feather from the girdle inside (hidden under one of the gold prongs). The inner-grade is low and receives the grade 1, which means it’s borderline being a fancy pink. ...