Platinum, cabochon ruby and diamond necklace, France. Photo Sotheby's.

The geometric collar of articulated form, the panels set with 84 cabochon rubies weighing approximately 100.00 carats spaced and bordered by baguette, old European and single-cut diamonds weighing approximately 25.60 carats, internal circumference approximately 14 inches, with French assay and maker's marks; circa 1930. Estimation 100,000 — 150,000 USD

Litterature: Illustrated in The Necklace: From Antiquity to the Present, by Daniela Mascetti and Amanda Triossi, page 171. 

Accompanied by GIA report no. 2125477755 stating that three randomly tested rubies are of Burmese origin, with no indications of heating. 

Sotheby's. Magnificent Jewels.New York | 11 déc. 2013www.sothebys.com