I actually bought this piece by accident. It isn't stamped but it is worked silver. (I'm learning silversmithing myself). If you are looking for something for your sister you might also be interested in my jewelry at www.etsy.com/shop/joliejoujous. I'm now working my own stones as well. This could turn out to be an obsession. Anyway, I can ship directly to your sister if you want.
Thanks I will keep an eye on your Etsy shop. I bought a picture jasper bracelet from Doug Cawthra (Hartsel House) on Etsy. He works with .999 pure silver by hand in Colorado. I like the hand crafted jewelry so much better than the imported stuff. Definately bidding!
Thanks for looking, I think my pieces are unique but I haven't gotten the photographs right yet. This labradorite piece is definitely hand set as well.