Lot 497. The Estate of Mary, Duchess of Roxburghe. A Diamond Tiara, by Cartier, circa 1930sEstimation 295,000 — 495,000 CHF. Lot sold 2,410,000 CHF. Photo Sotheby's. 

Of geometric design, set throughout with circular-cut diamonds surmounted by a graduated series of thirty-one collet-set diamonds, inner circumference approximately 415mm, signed Cartierfitted case stamped Cartier, the exterior of the case with monogram and coronet for Mary, Duchess of Roxburghe.

Sotheby's. Magnificent Jewels and Noble Jewels, Genève, 12 mai 2015