Pre-Auction Analysis: May 2017, Christie’s Hong-Kong

This pre-auction analysis will focus on visual elements that are not expressed on the GIA report, as well as other general observations that won’t appear in the catalog, such as Undertone, Color Dispersion, and Inner-Grade (UDI). We use grades 1, 2, 3, and 4 to describe these features. . Stones with a total quality score that ranges from 8 to 12 are considered to be top gems and are suitable for high-end jewelry, collectables, and so on.

It is often difficult to identify these characteristics when viewing fancy color diamonds in an auction catalog or online, especially when the images are heavily processed. All images in this review were taken with an iPhone 7.

Important note: We strongly recommend downloading the beta version of the new FCRF app and using the auction calculator. This app lets you calculate your bidding price (per carat), including the house commission, as you follow the lot.

Lot No’ 1941

3.37 carat fancy intense blue hexagonal shape diamond, I1

High catalog estimation: US$237,400 per carat

Low color dispersion is inherent in very flat diamonds (with low depth percentage) and color manipulation is very challenging in shapes such as hexagon. Having said that, however, this rare blue diamond has a relatively decent color dispersion, considering these circumstances.

The inner-grade is above the average intense blue, and the undertone has a low gray influence. Inclusions in