Yes it is a piece of stained glass. I cut it with a glass cutter and ground the edges to a smooth bevel with a glass grinder. Used a dremel for the hole in the top, put blue tape over it and into the GF for etching. I then dry-brushed the etching and once dry took the tape off. Some of the paint came off when I used a sponge to clean what got under the tape but I like the aged look it gives.
You definitely can! I used 400 speed at full power, a single pass. Beveling the edges slightly is easy on a grinder if she doesn’t have an actual beveling tool. I also know that there is a paint that won’t come off so easily that is used for stained glass. I just didn’t remember it until after I did these.