Pair of 18ct gold, amethyst and tourmaline 'Byzantine' drop earrings, Verdura. Estimate $8,000 - $12,000. Photo: Sotheby's.

Each surmount collet-set with a faceted hexagonal-shaped amethyst suspending a similarly set circular-cut tourmaline terminating in a lozenge-shaped amethyst swing drop, length approximately 50mm, signed Verdura, post and clip fittings.

Sotheby's. Important Jewels, 31 Aug 2015, Sydney, 6 PM