Lot 497. The Estate of Mary, Duchess of Roxburghe. A Diamond Tiara, by Cartier, circa 1930s. Estimation 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 Cartier, fitted case stamped Cartier, the exterior of the case with monogram and coronet for Mary, Duchess of Roxburghe..