Web site: https://www.ancient-jewellery.com/
This is a fabulous hardstone cameo ring, dating to the early 19th century. The ring is made from 18k gold (tested but not marked). It is set with an onyx cameo, sculpted with a male head - likely a rendering of a younger Nero. The gem is nicely cut and polished, it could be older than the early 19th century, certainly 18th or even a Roman original?
OBJECT: Cameo ring
CULTURE: Classical Revival
DATE: early 19th century or older
MATERIAL: Onyx & 18k Gold
SIZE: 23mm x 22mm x 2mm ( cameo 15mm x 11mm x 4mm)
RING SIZE: 8 1/2 (US) Q 3/4 (UK)
WEIGHT: 3 grams
PROVENANCE: Formerly in a private collection, Cambridge.