A ruby and diamond ring

A 20.26 carats Thailand oval-cut ruby and diamond ringEstimate $200,000 – $300,000. Photo Christie's Image Ltd 2015.

Set with an oval-cut ruby, weighing approximately 20.26 carats flanked on either side by a shield-shaped diamond, mounted in platinum, with French assay mark

With report 0708701 dated 20 April 2012 from the Gübelin Gem Lab stating that gemmological testing revealed characteristics consistent with those of rubies originating from Thailand (Siam). Indications of heating

Christie'sMAGNIFICENT JEWELS, 14 April 2015, New York, Rockefeller Plaza