Carat Ruby Crystal weighing 100 pounds to be auctioned by Bonhams

Bonhams will offer the largest ruby crystal ever auctioned at its Gems, Minerals, Lapidary Works of Art and Natural History sale in Los Angeles on May 20. The crystal, in zoisite, was mined in Longido, Tanzania, and weighs 100 pounds, or 228,000 cts.  read more