Large top Native American ring of tested sterling silver with a large natural turquoise nugget, a sea green color with darker green and a touch of black matrix, some natural pitting in the stone, lovely patina, very fine silver work around the stone and one Navajo silver tear. Ring is a size 7 and 1/2. The top of the ring measures 1 and 1/2" by 1 and 1/4". Really a wonderful ring, from a fine collector. No maker marks and would not expect to see any in an older ring.