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Details & Cataloguing

Magnificent Jewels and Noble Jewels

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Geneva

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.
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Accompanied by GIA report no. 2155960584, stating that the diamond is Fancy Vivid Blue, Natural Colour, Internally Flawless. 

Catalogue Note

"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

Magnificent Jewels and Noble Jewels

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Geneva