| | Re: how are these made?
I'm guessing glass marbles too. I googled "Glass Marble Magnets" when seeing your post and was AMAZED at what people are making with these. Incredible!
I have seen these done commercially and sets given as prizes for Girl Scout fundraisers. All I know though, is that they're not very durable in the long run (surprisingly) and the stones seemed to chip and crack easily. Not sure if it was just those stones in particular, but I wonder if there's a way to strengthen them to resist chipping?