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Cameo Ring with Marie Antoinette and the Dauphin, French, late 18th century, gold, silver, diamonds, sardonyx, 3/4 x 11/16 in. (1.9 x 1.7 cm). The Walters Art Museum

The rectangular bezel of this ring is set with a sardonyx cameo featuring portrait busts of Queen Marie Antoinette of France (1755-93) and her son the Dauphin (1785-95). The cameo is surrounded by a border of diamond sparks in silver mounts (collets). The forked shoulders each enclose a tulip originally set with a crystal and connect to the channeled hoop.