Carcanet or carcan is a jeweled collar or necklace, from the old French, carcan, meaning collar. Carcanets were typically quite elaborate and formal, and worn closely fitted. The style seems to have first appeared with the reemergence of the necklace during the end of the medieval period in the late 1300s.
Originally published in France between 1876 and 1888, Auguste Racinet's Le Costume Historique was the most wide-ranging and intelligent study of clothing ever published. Covering the world history of costume, dress, and style from antiquity through the end of the 19th century, the great work - "consolidated" in 1888 into 6 volumes containing nearly 500 plates - remains, to this day, completely unique in its scope and detail.