Sorry I don't see a stamp. Its Tibetan silver (Tibetan silver is used primarily in jewelry components, and is similar to pewter - an alloy of copper, and sometimes tin or nickel, with a small percentage of pure silver)Nope no stone missing if it were I would not have listed:) I'm checking all jewelry carefully for many reasons. The main reason is I don't want less then what I expect so I treat others the same. I am going to post additional picture, hoping it would capture the beauty of this piece. I would guess maybe it look like that to u because the ring has stones in parts of the ring and not in other parts due to the design. Thanks for bringing this to my attention. If you look closer at the additional pictures I am posting you will see the designs are not that of a stone missing but just that several designs around the ring as the stones are.
In the pictures you will notice a pen pointing where I assume one might thing a stone is missing, this is a design on the ring if you notice there is a stone close by it or next to it. Also the stones glow but not the design.
I've posted the pictures. I hope this has helped. I would however suggest if you're not comfortable with the design, please don't bid. The pictures are the only way I can show the beauty of the items. I want all bidders to be comfortable and happy. Thank you for viewing.