Ask The 'Diamond Guy®' - Fred Cuellar Ask The Diamond Guy®
Every day Fred Cuellar answers questions about diamonds. Why? Because he’s one of the world's most renowned experts on the subject of diamonds. So you can ask a question here if you cannot find it in the database. Questions are not answered immediately. It may take some time for your question to be answered. When it is answered, you will receive an email notifying you and a link to the answer.

Sterling ESPO

Topic: Ring Setting


What does the ESPO mean on the inside of my ring.

It says sterlingESPO then halfway around the ring it says STER, please tell me what this means. Thank you.


Hi Tricia,
It probably means the ring is sterling silver and the ESPO is the manufacturer.
The Diamond Guy