Few Australian 'Lighting Ridge' black opals come as fine as this this spectacular specimen presented in its original Art Deco splendor - circa 1930. The beautifully proportioned oval cabochon bursts with a multichromatic explosion of electric confetti colors against a deep black matrix background. The hand fabricated platinum mounting sparkles with three-quarter carats of diamonds. By Brock & Co., an early 20th century, high-end Los Angeles jeweler. Just shy of 1 inch long, ring size 7 1/2.