An Art Deco onyx and diamond panel ring, the oval onyx ring head centred with an old-cut diamond with an estimated weight of 0.17ct, mounted within an applied lozenge frame embellished with diamonds, between diamond-set shoulders to D-profile shank, unmarked metal testing as platinum and 18ct gold, ring head 13.7 x 10.7 mm, size N½, total weight 2.8 grams.