Each set with a heart-shaped fancy deep blue diamond weighing 2.48 and 2.03 carats, suspending a detachable pear-shaped diamond weighing 10.12 and 9.64 carats, mounted in platinum, 3.0 cm long
Accompanied by four reports dated from 6 March 2007 to 3 June 2008 from the Gemological Institute of America with the following details:
Report Date Weight Colour Clarity
10454112 03/06/08 10.12 D VS2
16948833 07/04/08 9.64 E VS1
16160884 18/06/07 2.48 Fancy Deep Blue VS2
11205394 06/03/07 2.03 Fancy Deep Blue IF
Also accompanied by two supplemental letters by the Gemological Institute of America stating the 2.48 and 2.03 carat diamonds have been determined to be a type IIb. Type IIb diamonds are very rare in nature (from the laboratory’s experience, less than one half of one percent) and contain small amounts of boron that can give rise to a blue or gray coloration. An unusual property of type IIb diamonds is that they are semi-conductors and conduct electricity. Historically, the ancient mines of India produced occasional blue diamonds but today the most significant source is limited to the Cullinan (formerly Premier) Mine in South Africa.
Among famous gem diamonds, the 70.21 carat Idol’s Eye and the 45.52 carat Hope are examples of type IIb.
Lot sold on June 1, 2010 at the Christie’s Hong Kong Sales
Price Realized : HK$34,260,000 or US$4,416,306
Source : Christie’s Hong Kong Sale