Sardonyx Signet Ring

Sardonyx gems have been found in the archaeological recoveries at Knossos and it was used by the Romans to make amulets which they engraved with Mars, the God of War and wore to give them courage. It is one of the earliest stones used for seals and signet rings and as such is a particularly traditional choice. 

Some of the loveliest stones are found in India but it is also mined in places such as Brazil, Germany, the USA and Russia.