An emerald and diamond double-clip brooch, by Tiffany & Co. Estimate: $12,000 – $15,000. Photo Christie's Image Ltd 2015

Each clip designed as a baguette-cut diamond scroll, interspersed by collet-set circular-cut diamonds, spaced by three curved lines of calibré-cut emeralds, overlapped by two circular-cut diamond ribbons, 2 3/4 ins., mounted in platinum - Signed Tiffany & Co.

Christie's. IMPORTANT JEWELS, 20 October 2015, New York, Rockefeller Plaza