From Brooke's Orbit Collection, one of a kind 18k Gold Boulder Opal Landscape Necklace.                  18k Gold Georgian Style Bezel Boulder Opal Necklace. - Metal: 18k yellow gold - Center Stone: Boulder Opal, 57.22 ct - Setting Measurements: 35 mm × 35 mm - Design: Georgian-style bezel setting - Necklace type: One of a kind