Superb fancy vivid blue diamond ring

Set with a pear-shaped fancy vivid blue diamond of exceptional colour weighing 7.32 carats, size 51, illustrated unmounted.

Accompanied by GIA report no. 2155960584, stating that the pear modified brilliant-cut diamond weighing 7.32 carats and measuring 18.21 x 11.35 x 4.63mm, is Fancy Vivid Blue, Natural Colour, Internally Flawless. Stamped 750 for 18 carat gold, mounted in white gold. For further details on the diamond, please refer to the GIA report. No evidence of wear to the metal, in like-new 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."

"Diamonds obtain their colour from so-called "colour centres". They are single or mutliple non carbon atoms that replace carbon in the structure of the diamond, causing a disturbance in the structure and sometimes giving rise to the colour. The distinctive blue colour in diamonds is attributed to trace amounts of the element boron in the crystal structure. Minute traces of boron are required to create the colouration. Less than one boron atom per million carbon atoms is sufficient to produce the blue colouration".

Excerpt from the Natural History Museum website