AN IMPORTANT DIAMOND RING, MOUNTED BY CARTIER

细节

AN IMPORTANT DIAMOND RING, MOUNTED BY CARTIER
Set with a pear-shaped light blue diamond weighing 24.92 carats to the shield-shaped diamond shoulders, mounted in 18k gold, ring size 6½
Mount by Cartier
Accompanied by report no. 17458553 dated 11 July 2008 from the GIA Gemological Institute of America stating that the diamond is Light Blue colour, VVS2 clarity

With a working diagram stating that the diamond is Potentially Internally Flawless

With an appendix stating that the diamond is a Type II b diamond

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拍品专文

The Gemological Institute of America distinguishes diamonds with the palest of blue tints from colourless diamonds, and classifies these rare stones formerly graded 'D' as Type II b. These Type II b diamonds are semi-conductors of electricity due to minute quantities of boron in the crystal lattice. They are extremely rare and it is reported that less than one in 1000 fine quality diamonds can be classified as Type II b. All naturally occuring blue diamonds, ranging from palest to deepest blue, fall into this category.