One of a kind. Gump’s is forever treasure hunting for the best of everything and our collection of estate jewelry— featuring rare antique pieces — is no exception. Distinguished in provenance, each item is one-of-a-kind, reflecting its distinctive gemstones, materials and craftsmanship. 60 diamonds, est. 1.75ctw. 18 calibre-cut sapphires. Platinum. 1 1/2" diam.