Pre-Auction Analysis: November 12th 2019, Christie’s Geneva, Magnificent Jewels

Our Christie’s Geneva Pre-Auction Analysis focuses on elements that are hidden from the unprofessional eye. We will describe the important visual elements for those who cannot attend the preview and discuss characteristics such as: Undertone, Color Dispersion, and Inner-Grade (UDI; a detailed explanation appears at the bottom of this article). When we analyze and grade any Fancy Color Diamond it is always done in relation to its GIA grade.

We use grades 1, 2, 3, and 4, 1 being the lowest grade. Grade + is granted in rare cases and stands for stones with an exceptional characteristic. Stones that receive a minimum total UDI score of 8, without a red remark, are considered to be “Gems” and are generally sought after by high-end jewelry brands, collectors and the investment community.

For your convenience, we have added direct links for the GIA reports.

• All images in this article review were taken with an iPhone 11pro, no filters were applied.
• All auction valuations are per carat and in US Dollars.

Lot # 246

7.03 carat Fancy Deep Blue, Emerald cut. MOUSSAIEFF. High catalogue estimation: $1,991,465 pc

Price realized: $1,666,006

A large fancy deep blue diamond with 69.9% depth and a relatively small table  (51%). Because Deep/Dark Fancy Color Diamonds are highly saturated, analyzing the inner-grade is practically unnecessary as it will always receive the highest possible grade. The undertone on the other hand,