Important Diamond ring. Photo: Sotheby's Claw-set with a brilliant-cut diamond weighing 10.64 carats, on a plain white gold mount, size 54. Estimate 370,000—570,000 CHF. Lot Sold 1,202,500 CHF Accompanied by GIA report no. 1132191696 stating that the...

Magnifique tiare en émeraudes et diamants d’une extrême rareté, env. 1900. Ayant appartenu à la Collection de la Princesse Katharina Henckel von Donnersmarck/ Est. CHF 4,6-9,2 millions/$5-10 millions. Photo Sotheby's Le 17 mai 2011, six mois après la...

Important Diamond ring, M. Gérard. photo courtesy Sothebys The pear-shaped diamond weighing 16.48 carats, flanked by baguette diamonds, mounted in yellow gold, size 52, with ring sizer, signed M. Gérard and numbered, French assay and maker's marks. Est....