AN UNUSUAL CARVED GEMSTONE, ENAMEL AND GOLD NECKLACE

St. Petersburg, early to mid-19th century

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Designed as three cartouche-shaped openwork links of chased 14K gold, enhanced with blue enamel scrolls and set with oval chalcedony, bloodstone and amethyst intaglios, attached to a backchain of similar gem-set design, one intaglio mounted as a clasp (enamel chips)