Platinum, 18ct gold, amethyst, garnet and diamond ring, Costagli. centring a claw-set hexagonal-cut amethyst shouldered by triangular garnets to a partially pave-set diamond band, the amethyst, garnets and diamonds together weighing approximately 9.01, 1.50 and 0.18 carats respectively, size M, signed Costagli, New York.