A Superb Antique Australian Black Opal and Diamond Pendant Necklace - Pin in 14K Yellow Gold, Art Nouveau - Deco Style, circa 1950. This gorgeous fine estate piece holds three natural, genuine, solid Australian black opals with the most magnificent color. The longest center opal measures about 11mm long x 5mm wide. The opals are joined by two sparkling white diamonds. The setting is done in the Art Nouveau style and is composed of 14K yellow gold. The piece comes complete with 14K gold chain measuring about 18 inches long. The pendant can also be worn as a pin/brooch. The pendant measures about 1 3/8 inches long by about 1 inch wide. This piece is estimated to date circa 1950 and is in lovely vintage condition.