
ornamental necklace, collar or headband
Found on
http://phrontistery.info/c.html

• (n.) A jeweled chain, necklace, or collar.
Found on
http://thinkexist.com/dictionary/meaning/carcanet/
Car'ca·net (kär'kȧ*nĕt)
noun [ Dim. from French
carcan the iron collar or chain of a criminal, a chain of precious stones, Late Latin
carcannum , from Armor.
kerchen bosom, neck,
kelchen collar, from
kelch circle; or Icelandic
kverk troat, Old ...
Found on
http://www.encyclo.co.uk/webster/C/24

A carcanet was a necklace or collar of jewels. They were manufactured in Venice during the fifteenth century.
Found on
http://www.probertencyclopaedia.com/browse/PC.HTM
No exact match found.