Various articles, principally brooches, pendants, bracelets, and finger rings, decorated with a portrait, usually executed by carving as a cameo or by enamelling as a medallion on porcelain, bone chinaor copper, or painting on vellum set under a crystal. Rings made in the Roman period often bore portraits, as did enamelled pendants made in the 16th/ 17th centuries and enamelled rings, braceletclasps, etc., made in the 18th century.
Portrait Jewelry

Portrait Jewelry
Various articles, principally brooches, pendants, bracelets, and finger rings, decorated with a portrait, usually executed by carving as a cameo or by enamelling as a medallion on porcelain, bone chinaor copper, or painting on vellum set under a crystal. Rings made in the Roman period often bore portraits, as did enamelled pendants made in the 16th/ 17th centuries and enamelled rings, braceletclasps, etc., made in the 18th century.
References
From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson



