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Lot 1863. Important Pair of Unmounted 12.36 and 12.00 carats Type IIa Diamonds. Estimate 19,000,000 — 25,000,000 HKD. Lot sold 22,300,000 HKD. Photo: Sotheby's.

The two pear-shaped diamonds weighing 12.36 and 12.00 carats respectively.

Accompanied by two GIA reports numbered 5171492749 and 2185466725, dated 13 March 2017 and 5 July 2017 respectively, stating that the 12.36 and 12.00 carat diamonds are both D Colour, Flawless and Internally Flawless respectively, with Excellent Polish and Symmetry; further accompanied by two diamond type classification reports stating that both diamonds are determined to be Type IIa diamonds. Type IIa diamonds are the most chemically pure type of diamonds and often have exceptional optical transparency.

Sotheby's. Magnificent Jewels and Jadeite, Hong Kong, 03 oct. 2017, 01:30 PM