This is a vintage turquoise and red coral ring. It is Native American and marked MGM. It also has a mark that looks like a teepee or a V. The ring is a size 9. The ring measures 1-1/8 inches across the top. The turquoise is 1 inch long and the coral is 1/2 of an inch long. The turquoise does have a large vein of silver matrix across it. The ring is in good condition but does have an age patina and may need cleaning or polishing. Please let me know if you have any questions. Thanks for stopping by.