Lot 70. 18-karat gold, lapis lazuli, emerald and coloured diamond brooch, Tiffany & Co., Designed by Louis Comfort Tiffany, 1915–1930. Estimate $6,000–8,000. Photo: Sotheby's.

The rectangular lapis lazuli plaque set at the sides with two cabochon emeralds measuring approximately 7.7 by 5.4 by 5.7 mm, the frame additionally set with six old European-cut diamonds of yellow hue weighing approximately .50 carat, gross weight approximately 14 dwts, signed Tiffany & Co.; 1915-1930.

Exhibited: Shelburne Museum, Louis Comfort Tiffany: Nature by Design, Shelburne, Vermont, 20 June - 25 October 2009.

Literature: Alice Cooney Frelinghuysen, et al., Louis Comfort Tiffany: Nature by Design, page 43.

John Loring, Louis Comfort Tiffany at Tiffany & Co., page 77

Note: Please note the diamonds have not been tested for natural origin of color.

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