Gem quality Thomsonite is only found in a couple of places in the world. Lucky for me, it's it my neck of the woods. People used to find it at the Thomsonite Beach outside of Grand Marais, Minnesota.
These days you're lucky to find one on the beach and if you do, you won't find pieces bigger than 1/4 inch. This is an "old stock" piece that I bought from an old timer. I was doing an art show in Grand Marais and he came by with some Thomsonite. It's the only one I have left.
The Thomsonite is 3/4" tall by 1/2" wide. I accented the ring with a garnet.
The ring is made with sterling and fine silver.
It is about a size 8 1/4. Not adjustable.