A fabulous Opal and Diamond RingProbably one of the finest opal rings we have shown from our stock of antique rings. The cabouchon cut opal shown is cushion shaped, measures 15x13 (5. 78 carats) displaying a mass of vibrant colours, from flashes of fireglow orange, luminous greens, and lavender purples. Retained by a yellow gold bezel, and around the outer edge white diamonds, 2mm each. Each shoulder is a fleur de lys pattern, set with small diamonds. Total diamond content estimated