A Spectacular Emerald-Cut Diamond. The emerald-cut diamond weighing 100.20 carats, mounted in platinum . Sold for $22.1 million / CHF 21.2 million / HK$172.3 million ($220,459 per carat). Photo: Sotheby's. NEW YORK, NY .- Today’s sale of Magnificent Jewels...

Cartier Art Deco platinum, diamond, coral, pearl and onyx brooch, 1920's. Deep red orange coral circle set with 64 small diamonds and two 5 mm pearls from which drops a long pendant of onyx and platinum links with conical fob of coral, pearls and diamonds,...