It is very lightweight, so I'm not sure if it is resin or some other kind of material. It doesn't appear to be glass.
This is the focal gem from the bead mix I found at Joann's over the weekend. I posted some crazy gold puffy pillow beads yesterday and wait till you see the sparklies that are coming tomorrow!
As I post these, I'd love to hear your ideas about them individually and when they've all been posted, I will be doing a bead mix giveaway based on the final comments!! :)