Web site: https://www.ancient-jewellery.com/
This is a nice and expressive Neoclassical carnelian gem intaglio, dating to the 18th century. It is cut with a portrait of Neptune (god of the seas).
DATE: 18th century AD
SIZE: 14mm x 12mm x 3mm
WEIGHT: 2.90 grams
PROVENANCE: From a private collection, London.