Ruby, Obsidian and Rock Crystal Quartz Chess Set-"The Frog Prince" Designed by Luis Alberto Quispe Inspired by the classic fairy tale of the Frog Prince this unique chess set is fabricated from Tanzanian ruby with alternating bases of Russian black obsidian or polished rock crystal quartz. The eyes are set with ruby cabochons, the cloaks, crown and scepters formed of gold vermeil. Height of King: 5in. Sold for US dollars 95,000. Bonhams.