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    Sale 1917

    Magnificent Jewels

    11 December 2007, New York, Rockefeller Plaza

  • Lot 314

    AN UNMOUNTED CIRCULAR-CUT COLORED DIAMOND

    Price Realised  

    Estimate

    AN UNMOUNTED CIRCULAR-CUT COLORED DIAMOND
    The fancy gray-blue circular-cut diamond, weighing approximately 3.09 carats
    With report 16253831 dated 19 September 2007 from the Gemological Institute of America stating that the diamond is fancy gray-blue, natural color, VS2 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 that 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 small 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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    Pre-Lot Text

    THE PROPERTY OF A LADY