Art Deco style first appeared in France in the 1920s and 1930s, when jewelry designers introduced more colorful gemstones, cut diamonds in less traditional forms, and placed a greater emphasis on elaborate and elegant settings. 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. Platinum. Diamonds, est. 4.70ctw. 2 1/2"L X 3/8"W.