A 12.08 carats Thailand ruby and diamond ring. Estimate $40,000 – $60,000. Photo Christie's Image Ltd 2015

Set with an oval-cut ruby, weighing approximately 12.08 carats, within a circular-cut diamond surround, mounted in platinum

With report CS 67384 dated 20 April 2015 from the American Gemological Laboratories stating that it is the opinion of the Laboratory that the origin of this ruby would be classified as Thailand. Heat enhancement. Minor to moderate clarity enhancement, heating residues type

The magnificent jewels of Margaret Adderley Kelly

Christie's. IMPORTANT JEWELS, 16 June 2015, New York, Rockefeller Plaza