This Sterling Silver medallion is a large 2 1/4 inches across. The circular design represents the ancient Aztec calendar. The piece is solid sterling silver and made in Mexico. There are various hallmarks on the back of the piece, a few are harder to read. The piece has both a bail for chains and a pin mechanism, so it can be worn as a necklace or as a brooch. The included chain is not marked and I am unsure if it is silver. The chain in incredibly long 55 inches. I currently have it doubled up on the medallion and it still fits over my head. The medallion weighs almost 2 oz without the chain, so this is an incredible value for just the sterling alone. The piece is in great shape and will get attention where ever you go.