A Burma ruby and diamond necklace. Estimate $450,000 – $650,000. Photo Christie's Image Ltd 2015

Designed as a graduated series of oval-cut rubies, each within pear-shaped diamonds, spaced by marquise-cut diamonds, mounted in platinum and 18k gold, 15 ins.

With report CS 67382 dated 20 April 2015 from the American Gemological Laboratories stating that it is the opinion of the Laboratory that the origin of these rubies would be classified as Classic Burma. Heat enhancement: None; further stating that this is an elegant ruby and diamond necklace containing eighteen Classic Burmese rubies

The magnificent jewels of Margaret Adderley Kelly

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