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    Sotheby’s to auction rare 12ct ‘Blue Moon’ diamond

    02/10/2015

    A stunningly blue diamond will be the centerpiece of Sotheby’s Magnificent Jewels and Noble Jewels sale in Geneva on 11 November 2015 with an estimated value of $35-55m (£22.6m-£35.4m). It weighs 12.03 carats and has been graded ‘fancy vivid blue’, the highest possible colour grading for blue diamonds.

     Natural blue diamonds are a rare discovery and the Blue Moon is one of those remarkable occurrences. At 12.03 carats, the Blue Moon is the largest cushion-shaped fancy vivid blue diamond ever to appear at auction.

     This sensational diamond also boasts exceptional clarity, having been declared “internally flawless” by the Gemological Institute of America (GIA).

    David Bennett, worldwide chairman of Sotheby’s international jewellery division, calls the diamond "magical and sensational" stone of perfect colour and purity.

    “Blue, for me, is the most mysterious and magical of all the colours of diamond, and the Blue Moon will now take its place among the most famous gems in the world.”

       

    Illustrated:

    ‘The Blue Moon’
    An exceptional Fancy Vivid Blue diamond weighing 12.03 carats, Internally Flawless.
    Estimate: 34,050,000-53,500,000 CHF / 35,000,000-55,000,000 USD

     

    Some questions about the Blue Moon Diamond that you need answered:

     

    HOW DOES A BLUE DIAMOND FORM?

    Diamonds with a strong saturated colour represent only a tiny percentage of all natural diamonds. The blue arises from trace amounts of the element boron in the crystal structure. Less than one boron atom per million carbon atoms is sufficient to produce the blue coloration.

     

    WHY IS CLARITY IMPORTANT?

    Clarity describes the size and number of inclusions in a diamond. Almost all diamonds contain minute traces of non-crystallised carbon, the element from which they were born. The Blue Moon diamond is free of any inclusions, and has been declared Internally Flawless by the GIA, perfect clarity grade.


    WHERE IS IT FROM?

    The Blue Moon Diamond was discovered by Petra Diamonds – owners of the famous Cullinam Mine in South Africa – in January 2014. It is the only reliable source in the world for blue diamonds, but these highly rare gems still only make up 0.1% of the diamonds unearthed at the mine.

     

    WHY IS IT CALLED THE BLUE MOON DIAMOND?

    The diamond’s name comes from its rarity – referring to the expression ‘once in a blue moon’. Another extremely rare and fascinating feature of this diamond is the highly unusual red phosphorescence, which can be observed when the stone is exposed to ultraviolet light.



     

    WHERE CAN I SEE THE BLUE MOON DIAMOND?

    Prior to its auction in November 11, Sotheby’s will exhibit the diamond in Hong Kong 3-6 October; London 18-22 October and New York 30 October-1 November.

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