I use any two part epoxy

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I use any two part epoxy that dries clear. Rough up both glass and metal where it is to be glued. Be sure you mix equal parts and stir until it is no longer clear. Apply quickly. I put the item under the heat lamp to cure. Check before it gets too hard if you need to reposition. I use this on all jewelry, wine stoppers,letter openers. etc.The best part, you can buy this at any hardware store for less than $5.00. Bev