@stoneflower, have you learned how to polish the faces of your tools?
I mentioned “making your own tools” in an earlier post. This is important. Make a punch out of steel, or possibly brass or copper, spend time figuring out what size the face of your punch needs to be …which will be touching the metal. Your goal is to hammer on the punch, not the metal. The punch can be any size you need to fit the size of the bezel, and this will also help prevent damage to the stone. Therefore, you may end up with a lot of punches, sized to use on the variety of different sized bezels you will make.
It requires spending a lot of your valuable time to soften the faces of these tools before you polish them, so that they do not have any edges or anything that will transfer a mark onto the metal. You soften the face with any tools you can find …grind on it and when it looks good enough, keep going, sand it, slap the face of your punch with old files, and when it’s perfect, finally, give it a mirror polish.
This is a skill you will use repeatedly, because you do not want to add any marks to your metal.