BOUCHERON - 1925'S MAGNIFICENT BLACK OPAL RING This ring is set with a cabochon of black opal with a bright green and indigo blue shimmer in a claw bezel shouldered by two rolls of baguette diamonds, the ends accented with small cabochon rubies. Set in platinum. French work signed Boucheron Paris and numbered. Incomplete hallmark. Gross weight: 4.53 g. Finger size: 53. Opal size: 14.93 x 10.64 x 5.62 mm. A precious black opal, diamond, rubies and platinum ring by Boucheron, circa 1925. French assay mark, signed Boucheron Paris and numbered. Incomplete maker's mark. Gross weight : 4,53 gr. Size : 53. Opal dimensions : 14,93 x 10,64 x 5,62 mm.