Diamond, the hardest material on earth, is composed of pure carbon with a uniquely strong isometric crystal structure; each carbon atom is bonded the same way in each direction. This atomic structure also allows for extraordinary optical and physical properties: extreme hardness, exceptional transparency, adamantine luster, strong refraction and dispersion of light. Diamond’s basic structure renders it a natural marvel and brilliant wonder, affirming its foremost position as the King of Gems.
Christie’s is pleased to offer lots 233 and 234, two extraordinary diamonds weighing approximately 14.11 and 40.43 carats. Graded ‘D Flawless,’ the highest accolades for both color and clarity, these diamonds are exceedingly rare with their superb quality and size.
In addition, the Gemological Institute of America has determined that each of these diamonds exhibits ‘Excellent’ symmetry, polish and cut. While ‘Excellent’ symmetry exhibits fifty-eight perfectly aligned facets with an accuracy of up to 1/200th of an inch; ‘Excellent’ polish confirms the quality of a diamond’s surface condition as a result of the polishing process. Finally, the cut grade considers a round brilliant diamond’s proportions together as a whole, as well as individually. If even just one parameter receives an individual grade less than ‘Excellent’, the entire cut grade is lowered.
The following diamonds have also been determined to be Type IIa. Type IIa diamonds are the most chemically pure type of diamond and often have exceptional optical transparency. Type IIa diamonds were first identified as originating from India, particularly from the Golconda region, but have since been recovered in all major diamond-producing regions of the world. Among famous gem diamonds, the 530.20 carat Cullinan I and the 105.60 carat Koh-i-noor, are examples of Type IIa.
The combination of these factors – D color, Flawless clarity, ‘Excellent’ symmetry, polish and cut, Type IIa and carat weight – speaks to the top quality and true rarity of these two perfect diamonds.
PROPERTY OF A PRIVATE COLLECTOR