Pre-Auction Analysis: November 13th 2019, Sotheby’s Geneva, Magnificent Jewels and Noble Jewels

Our Sotheby’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 # 413

3.03 carat Fancy Vivid Blue, Radiant cut, SI1. High catalogue estimation: $1,563,487 pc

Didn’t reach the minimum

A vivid blue cushion cut with a low depth percentage of 54%, complementing its look in relation to the carat weight. It seems like great efforts were made to yield a 3 carat diamond from the rough. The consequences of this motivation resulted