A collier de chien (dog collar) was a type of choker/necklace favoured in the Belle Epoque/Art Nouveau/Edwardian period. It wasn't a type of jewellery much made by Arts and Crafts jewellers of the time, as Arts and Crafts jewellery represented freedom and movement, while colliers de chien represented formality and constriction. Colliers de chien were popular from c1880-1910; in the latter years of this period plaques de cou - a central plaque often worn on a wide ribbon - were popular.
AN ART NOUVEAU PEARL AND ENAMEL CHOKER The central curved panel designed with green plique à jour enamel foliage and natural pearl berry clusters to the nine-row pearl choker with foliate spacers and clasp, circa cm long
Belle Epoque opal and diamond choker necklace, circa With four rows of opals and three rows of pearl and diamond flowers, this antique choker has 80 carats of opals stones), 232 rose cut diamonds carats), and 96 pearls. At Lang Antiques.