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An American Art Deco moonstone diamond and platinum ring by Black Starr & Frost

This beautiful platinum Art Deco ring has a slightly domed filigree work top in the centre of which is a fine sugar loaf cabochon moonstone with a fine eye. The filigree work is randomly set with round diamonds some in mille-grained rubover tube settings and some in bead claw settings. There are round diamonds set around the base of the moonstone in mille-grained rub over settings
The tapering platinum shank is stamped "B S & F" for Black Starr & Frost and Irid Plat for platinum.

Estimated weights colours & clarities
The moonstone:
Estimated weight: 3.50cts
Cut: sugar loaf cabochon
Estimated colour: translucent yellowish blue
Estimated clarity: eye clean (EC) with a very fine eye

The diamonds:
Total estimated weight: 0.75cts
Cut: a mixture of Victorian brilliant cuts & eight cuts
Estimated colour: F - I
Estimated clarity: VS - SI

Weight of ring: 1/4oz - 7gms
Ring Size: N (UK) - 7 (US)

Weights, colours & clarities of the stones are estimated as the stones have been examined and measured in their settings. Where the stones carry an independent certificate this will be indicated.

Black Starr & Frost are one of America's oldest jewellers tracing its roots back to 1810 when Erastus Barton and Frederick Marquand opened Marquand and Barton near New York’s Maiden Lane. Its merchandise was eclectic and varied including, lamps, jewelry, paintings, porcelain, and artistic objects. In 1876, the firm changed its name from Black, Ball, and Co. to Black, Starr, and Frost, and moved to 251 Fifth Avenue. It then focused on jewelry and silver objects, some imported from Europe, some produced in-house. For many decades, Black, Starr, and Frost was considered one of the great American jewelers. In 1876, it was invited to exhibit at the Centennial Exposition in Philadelphia along with renowned firms like Tiffany & Co. Whiting, and Gorham. In 1929, it merged with Gorham to become Black, Starr, Frost—Gorham and in 1939, it was one of five American jewelers invited to exhibit at New York’s World’s Fair. In 2006, Alfredo Molina acquired the firm.Black Starr & Frost is now located in Costa Mesa, California.