ART DECO RING In platinum and white gold, set on yellow gold claws with a rectangular emerald weighing approximately 2 cts, the stepped shoulder set with baguette diamonds. Circa 1930. A diamond, platinum and 18k gold Art Deco ring set with a rectangular shaped emerald weighing approximately 2 cts. Circa 1930. C.G.L. certificate attesting: origin Colombia (Colombia), impregnation minor (minor). RC : Partially effaced hallmark. Stone dimensions: 10.9 x 6.2 x 4.0 mm. TDD: 55; US: 7 1/2 (changeable). Gross weight: 5.6 g (18k - 750 and Pt - 950).