60's Amethyst Poison RingVintage circa 1960 poison ring is sterling silver and was made in Mexico. There is no stamp visible. This company was known for making these great poison rings and other biker and hippie sterling silver jewelry in that decade. This one is adjustable and is currently a size 6. 5, but could probably be sized up or down one size, fitting a small to average woman's finger. The cabochon stone is purple amethyst. It still opens with ease and locks with