Your revolving Cameo Ring sounds interesting! If the cameo material is black, it could be made from black agate.
Cameo is a Cameo Habille (French) which is a type of Cameo depicting the head of a person, carved in the stone, wearing a necklace, hair ornament or ear-rings, made of small gemstones, ie. diamonds. Cameo Habille pieces were made in the Victorian era. We do not provide valuations on the forums. If you would like a Valuation the form can be submitted Here... Kind Regards Rebecca ANTIQUE JEWELRY INVESTOR SUPPORT TEAM
