18K WHITE-ON-YELLOW GOLD AND BLACK OPAL CARTOUCHE DESIGN PENDANT. In the Edwardian taste. Lightening ridge double-sided black opal weighing app. 10 ct. bezel-set in yellow gold within bow-knot and ribbon design setting with numerous round diamonds together weighing app. 2.00 ct. - L: 2 1/2 in. Estimate $4,000-6,000