The 25.5-carat Sunrise Ruby achieved $30.3m at Sotheby's Geneva on April 12, setting a new world auction record for a ruby.
It also set a record for a piece of jewellery by Cartier.
 The Sunrise Ruby is among the largest Burmese rubies ever found |
Sotheby's comments: "Its vivid but saturated colour, poetically referred to as pigeon blood red, is due to a combination of well-balanced trace elements in the stone, typical and characteristic for the finest rubies of Mogok.
"Based on our records we can conclude that a natural ruby from Burma of this size and colour is extremely rare. Thus, the described gemstone with its combination of outstanding characteristics can be considered a unique treasure of nature."
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