Alabaster & Wilson, a fine Art Deco black opal and diamond ring, 1930s, claw-set with a cabochon
Alabaster & Wilson, a fine Art Deco black opal and diamond ring, 1930s, claw-set with a cabochon black opal measuring 13.7 x 8.4 x 3.4cm, mounted in platinum, size L, maker's mark A&W for Alabaster & Wilson