Diamond solitaire tourbillon ring. Set with a cushion shape old mine diamond in an open back rubover setting with an approximate weight of 0.60 carats, to a tourbillon solitaire design with polished edges, a smooth gallery and circular open backholing, leading to tapering swirling shoulders featuring millegrain decoration that terminates in intricate chevron engraving, flowing through to a solid D-shape shank. Marked 14 carat yellow gold and white gold, maker's mark 'EBC' circa 1905.