Sterling silver Miguel Garcia Martinez amethyst ring. This simply styled ring features a large, natural oval cabochon amethyst. The top of the ring measures 16.5mm by 9.5mm. The back of the ring is marked Miguel sterling Mexico 925. It is a size 5.5. There are some natural imperfections on the surface of the stone. Otherwise, it is in excellent condition. It dates to the 1950's. Martinez was an important Taxco designer at Rancho Alegro in Mexico.