Translucent White Play-of-Color Opal Stone Cabochon in Necklace

René-Jules Lalique (1860-1945), a well-known Art Nouveau designer of the Edwardian era, incorporated opals into his jewelry pieces, like this necklace. Gold, enamel, opals, and amethysts. France, circa 1897-1899. Gift of Lillian Nassau, 1985. Metropolitan Museum of Art, New York. Public Domain.

Article: An Incredible Union of Colors: Choosing Opal Engagement Ring Stones

Credit: Metropolitan Museum of Art