Anything silver with any pretty stone will be snapped up by the Apache or Navajo Indians. It's a sellers market there. Generally the indians will pay 25-40% more for the silver. Conversely, Arizona is NOT the place to Buy silver.
No. I made the setting from silver sheet and bezel material. I had no stamp to mark it with. I made two pieces, and that was the last of my silversmithing. I've not tried again in the 6 years since that attempt.