A RUBY AND DIAMOND RING, BY OSCAR HEYMAN & BROTHERS

A RUBY AND DIAMOND RING, BY OSCAR HEYMAN & BROTHERS Set with a cushion-cut ruby, weighing approximately 10.85 carats, within an oval-cut diamond surround, ring size 6 1/2, mounted in platinum and 18k gold With maker's mark for Oscar Heyman & Brothers, no. 300299 <i>Accompanied by report no. CS 1077467 dated 10 August 2016 from the AGL American Gemological Laboratories stating that it is the opinion of the Laboratory that the origin of this ruby would be classified as Thailand, with evidence of heat enhancement and insignificant clarity enhancement, heating residues</i>