Each is an item of jewelry that is primarily distinguished by the body part around which it is wrapped. Jewelry is too generic a term, since it would include earrings as well, which are not wrapped around the wearer.
Example:
She preferred the versatility of [blunks], which could be on display as a necklace during dinner, but safely hidden around her ankle or wrist while walking home through the city.
Best Answer
Circlet may work for you; it's a bit shaky, but jewelry houses clearly often use it to refer to pieces intended to be worn as necklaces, and some sources at least define anklets and bracelets as types of circlet.