18 Karat Gold, Platinum and Fancy Brownish Yellow Diamond Ring. photo Sotheby's

The oval diamond of fancy brownish yellow color weighing 10.52 carats, flanked by triangular-shaped near colorless diamonds weighing approximately 2.00 carats, size 5¾. Estimate 60,000—80,000 USD. Lot Sold 86,500 USD

Accompanied by GIA report no. 5121854130 stating that the diamond is Fancy Brownish Yellow, Natural Color, VS1 clarity.

Pair of 18 Karat Two Color Gold, Fancy Intense Yellow Diamond and Near Colorless Diamond Earrings. photo Sotheby's

Set with cut-cornered rectangular modified brilliant-cut diamonds of fancy intense yellow color weighing 2.05 and 2.01 carats, framed and surmounted by small round near colorless diamonds weighing approximately .55 carat. Estimate 30,000—40,000 USD. Lot Sold 55,000 USD

Accompanied by GIA report no. 16832748 stating that the 2.05 carat diamond is Fancy Intense Yellow, Natural Color, VS2 clarity; and GIA report no. 17161253 stating that the 2.01 carat diamond is Fancy Intense Yellow, Natural Color, SI1 clarity.

18 Karat Two Color Gold, Fancy Yellow Diamond and Near Colorless Diamond Pendant-Necklace. photo Sotheby's

The heart-shaped diamond of fancy yellow color weighing 3.86 carats, framed by small round near colorless diamonds, completed by an 18 karat white gold chain collet set with round near colorless diamonds, the total diamond weight approximately .65 carat, length 17 inches. Estimate 40,000—60,000 USD. Lot Sold 50,000 USD

Accompanied by GIA report no. 1102026957 stating that the diamond is Fancy Yellow, Natural Color, SI1 clarity.

Sotheby's. Important Jewels, 02 Feb 11, New York www.sothebys.com