Diamond tiara-necklace, circa 1910 - Sotheby's.  

The graduated open work spade-shaped motifs set with cushion-shaped, circular-, single-cut and rose diamonds, set along a row of similarly cut stones, spade motifs and line of diamonds detachable, accompanied by additional fittings including original screw driver, fitted case stamped F. Kandelhart, Juwelier, Wien VII, Zollergasse 35. Estimate: 15,000 - 25,000 CHF - LOT SOLD. 50,000 CHF

Sotheby's Magnificent Jewels Geneva | 14 Nov 2012 www.sothebys.com