Vintage Heavy solid sterling silver signet ring. It is stamp decorated on the side and set with a malachite stone. The stone looks chipped on the end, but with inspection using my jeweler's loupe I see that is has a flat end the is lapidary work and it was set this way. The bezel has not been touched since the ring was made. 

Size 12 Face measures 7/8" long. Hallmarked inside. Made in Taxco, Mexico. Weight: 21.6 grams.