This extremely rare Burmese ruby, with its "pigeon's blood" hue, will be offered at auction by Sotheby's Geneva at its Magnificent Jewels and Noble Jewels auction on 12 May, with an estimated value of $12-18million. Named The Sunrise Ruby, it looks set to

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This extremely rare Burmese ruby, with its "pigeon's blood" hue, will be offered at auction by Sotheby's Geneva at its Magnificent Jewels and Noble Jewels auction on 12 May, with an estimated value of $12-18million. Named The Sunrise Ruby, it looks set to

This extremely rare Burmese ruby, with its "pigeon's blood" hue, will be offered at auction by Sotheby's Geneva at its Magnificent Jewels and Noble Jewels auction on 12 May, with an estimated value of $12-18million. Named The Sunrise Ruby, it looks set to become the world's most expensive ruby.