Diamond diadem, early 20th century. Photo courtesy of Sotheby's.

The articulated and graduated band of open work geometric design, set with cushion-shaped, circular- and single-cut diamonds, diadem detachable from frame and may be worn as a bracelet, bracelet length approximately 163mm, one diamond deficient, accompanied by screw driver, fitted case stamped A. Aucoc. Estimation 12,000 — 18,000 CHF 

FROM THE COLLECTION OF THE FAMILY OF BARON HOTTINGER

Sotheby's. Magnificent Jewels. Genève | 13 nov. 2013 - http://www.sothebys.com