Belle Epoque Platinum, Gold, Violet Star Sapphire and Diamond Pendant-Brooch. Photo courtesy Doyle New York.

Centering one oval violet star sapphire approximately 31.19 cts., surrounded by two scallop-edged rows of 72 old-mine cut diamonds, spaced by 16 collet-set old-mine cut diamonds, altogether approximately 3.65 cts., circa 1905, approximately 13.2 dwts. With original fitted box. Estimate $40,000-60,000 

With Gubelin Gem Lab report no. 12080086 stating that the sapphire is of Sri Lankan origin, no indications of heating. 

Doyle New York. Important Jewelry. Wednesday, September 25, 2013 at 10am - http://www.doylenewyork.com