Important Fancy Intense Blue diamond ring

Set with a fancy intense blue pear modified brilliant-cut diamond weighing 10.09 carats, between similarly cut fancy light pink diamonds weighing 1.02 and 1.00 carats respectively, mounted in platinum and pink gold, size 52.

Please note that online bidding is not available for this lot. Band stamped PT950 and 750 for platinum and 18 carat gold. For further details on the diamonds, please refer to the three GIA reports. In very good condition.
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Please note that colour, clarity and weight of gemstones are statements of opinion only and not statements of fact by Sotheby's. We do not guarantee, and are not responsible for any certificate from a gemological laboratory that may accompany the property. We do not guarantee that watches are in working order. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue, in particular to the Notice regarding the treatment and condition of gemstones and to the Notice regarding import of Burmese jadeite and rubies into the US.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD "AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."

The conditions required to form a fine coloured diamond scarcely ever occur in nature, making them extremely rare and therefore increasingly coveted by gem collectors the world over.  Diamonds owe their colour to the presence of trace elements, or impurities and distortions, resulting from the pressures to which the diamond has been exposed as it formed.  The presence of nitrogen causes the diamond to take on the most common hue, which is yellow; contact with radiation can saturate a diamond with a rare green tint; and, when a diamond come into contact with the element boron during its creation, it may exhibit a highly sought after extraordinary colour – blue. In addition to the exceptional intense blue diamond found on this page, there are two other excellent examples in this catalogue, lots 483 and 491, which illustrate some of the variety in which these magnificent and sublimely rare gemstones can be found.