Magnificent and Exceptionally Rare Fancy Deep Blue 10.48 carats diamond

The fancy deep blue briolette diamond weighing 10.48 carats. Accompanied a duplicate of GIA report no. 11736022 stating that the diamond is Fancy Deep Blue, Natural Colour, Flawless. Estimate 6,720,000—10,000,000 CHF - Unsold.

NOTE: By definition, a precious gemstone must be beautiful, rare and durable. These criteria are more than fulfilled by the exceptional diamond shown here: a magnificent Fancy Deep Blue.

Diamonds are found in a variety of colours, each shade determined by their atomic structure. The blue diamond presented as lot 435- which to use the correct terminology is a Fancy Deep Blue – is an exquisite example, unsullied by secondary colours. Scientifically speaking the blue is due to the replacement of carbon atoms by boron in the crystal lattice of the stone, effecting its absorption of colour. Looked at emotionally, however, this stone is truly beauty personified. Cut as a superb drop-shaped briolette, its many facetted surface, designed to reflect and refract light, has the added virtue of being flawless and, in terms of polish and symmetry, has been awarded the highest possible grade by the Gemological Institute of America.
In Hong Kong recently, Sotheby's set a per-carat world record for any gemstone at auction when a superb 6.04 carat Fancy Vivid Blue emerald-cut diamond sold for HK$10 ($1.3) million per carat. This figure was narrowly exceeded by Sotheby's in Geneva this May when a 3.73 carat similarly coloured diamond sold for SF1,394,369 ($1,321,927) million per carat. Given this history of selling blue diamonds, this exceptionally large and exquisite gem is certain to attract attention.

Sotheby's. Magnificent Jewels. 19 Nov 08. Geneva. Photo courtesy Sotheby's. www.sothebys.com