From Brooke's Orbit Collection, one of a kind 18k Gold Australian Opal Heart Necklace with White Diamond Halo.                  18k Gold Georgian Style Bezel Australian Opal Necklace with White Diamond Halo. - Metal: 18k yellow gold - Center Stone: Opal, 6.53 ct - Accent Stones: Diamonds, 0.13 ct - Setting Measurements: 18 mm × 17 mm - Design: Georgian-style bezel setting - Necklace type: One of a kind