This extremely rare Burmese ruby, with its pigeon blood hue, will be offered at auction by Sotheby's Geneva at their Magnificent Jewels and Noble Jewels auction in May, with an estimated value of $12-18million.

This extremely rare Burmese ruby, with its pigeon blood hue, will be offered at auction by Sotheby's Geneva at their Magnificent Jewels and Noble Jewels auction in May, with an estimated value of $12-18million.