Silver tone and blue stone ring size 7 1/2

Natural blue stone, variety unknown. I think it resembles Larimar, it also looks a lot like a robins egg. There are no markings and I don’t know the metal used. It is non-magnetic. The ring itself seems rather light weight with all of the weight coming from the stone. Good overall condition, there are some scratches you can see on the band but there is nothing showing through.