Lot 77. 18-karat gold, opal, sapphire and garnet brooch, Tiffany & Co., Designed by Louis Comfort Tiffany, circa 1920. Estimate $60,000–80,000. Photo: Sotheby's.

Centering a round black opal measuring approximately 18.5 mm, within an openwork plaque set with numerous round sapphires, demantoid garnets and spessartite garnets, the reverse of the opal decorated with scrollwork flourishes, signed Tiffany & Co.; circa 1920. With signed box.

Provenance: Sotheby's New York, Jewels From the Estate of William B. Dietrich Sold to Benefit the William B. Dietrich Foundation, December 9, 2010, lot 17.

Sotheby's. Magnificent Jewels Including the Legendary Stotesbury Emerald, New York, 25 Apr 2017, 10:00 AM