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Silver-Topped Gold, Natural Pearl and Diamond Brooch, circa 1860. Estimate 6,000 — 8,000 USD. Photo: Sotheby's.

The oval-shaped design set with four natural pearls measuring approximately 6.7 to 4.8 mm, accented by numerous old mine and rose-cut diamonds weighing approximately 3.25 carats, fitted with pendant hook and removable pin finding; circa 1860. With fitted case stamped Collingwood Jewellers Ltd.

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