• Jewels: The New York Sale & Th auction at Christies

    Sale 2211

    Jewels: The New York Sale & The Annenberg Diamond

    21 October 2009, New York, Rockefeller Plaza

  • Lot 161

    A COLORED DIAMOND RING

    Price Realised  

    Estimate

    A COLORED DIAMOND RING
    Set with a cut-cornered modified square-cut fancy gray-blue diamond, weighing approximately 6.96 carats, within a circular-cut pink diamond surround, to the circular-cut pink diamond shoulders, mounted in 18k rose gold
    With report 16259387 dated 29 August 2007 from the Gemological Institute of America stating that the diamond is fancy gray-blue, natural color, VS1 clarity

    Accompanied by a supplemental letter stating that the diamond has been determined to be a type IIb diamond. Type IIb diamonds are very rare in nature (from our 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.


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