Gold, Silver, Natural Pearl, Enamel and Diamond Brooch, circa 1890. Estimate 6,000 — 8,000 USD. Photo: Sotheby's.

Of floral design, set with nine variously-shaped natural pearls measuring approximately 7.5 to 4.8 mm, accented by old mine and single-cut diamonds weighing approximately .75 carat, highlighted with green and peach-hued enamel, gross weight approximately 12 dwts; circa 1890. With fitted box. 

Accompanied by GIA report no. 1176217257 stating that the pearls are natural, saltwater.

Sotheby's. Important Jewels, New York, 24 sept. 2015