Black opal and diamond ring

The U-shaped band decorated on one side with a black opal of modified pear shape and a panel of pavé-set diamonds, the opposite side decorated with a second pavé-set diamond panel, the whole set with 103 round diamonds weighing approximately 2.00 carats, mounted in 18 karat gold. Estimate 5,000—7,000 USD

Sotheby's. Important Jewels. 04 Feb 09. New York www.sothebys.com photo courtesy Sotheby's