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

The cut-cornered square modified brilliant-cut diamond of fancy yellow color weighing 5.09 carats, flanked by triangular-shaped near colorless diamonds weighing approximately .60 carat, size 5½, signed A. Aletto. Estimate 30,000—50,000 USD. Lot Sold 46,875 USD 

Accompanied by GIA report no. 14462355 stating that the diamond is Fancy Yellow, Natural Color, VS1 clarity.

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Pair of 18 Karat Gold, Platinum, Diamond and Sapphire Earrings, Aletto Brothers. photo Sotheby's

Designed as flowerheads set with articulated polished gold petals, the centers set 'en tremblant' with round diamonds weighing approximately 4.20 carats, and cabochon sapphires, gross weight approximately 23 dwts., signed Aletto Bros. Estimate 7,000—9,000 USD. Lot Sold 8,750 USD

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Pair of 18 Karat White Gold, Platinum, Sapphire and Ruby Earclips, Aletto Brothers. photo Sotheby's

The clusters set with marquise-shaped and pear-shaped sapphires weighing approximately 30.00 carats, accented by round rubies, signed Aletto Bros. Estimate 6,000—8,000 USD. Lot Sold 7,500 USD

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Pair of 18 Karat Two Color Gold, Sapphire and Diamond Earclips, Aletto Brothers. photo Sotheby's

The concave disks set with cabochon sapphires, accented by small round diamonds weighing approximately .55 carat, mounted in 18 karat white and yellow gold, signed Aletto Bros. Estimate 5,000—7,000 USD. Lot Sold 5,625 USD

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