This ring is made of sterling silver and has a 3mm light blue topaz. It is very confortable to wear and you also can easy change the size a little bit so it suits in winter as in summer perfectly. The ringsize is 56(eu) but I can make the ring in any size, just put a specification in notes to the seller when you purchase. If you would like a special stone, oxidized ( black silver) or have any question please feel free to contact me.