So I recently picked up these two silver rings that I believe have some age to them..I think the one in the left is amethyst and I'm not sure about the one on the right..maybe jade?. The amethyst ring is simply marked "silver" and the green ring is marked "Sterling silver" does that give any indication on the age? I would like to learn more about jewellery but I'm finding it hard to date things and tell what the stones are without full hallmarks. Any ideas?