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It was definitely fused but I think I finally figured out how it was done: by heating the 2 pieces to 1500 I was able to achieve the effect.
Thanks for your help.

These are 1 inch circles with a convex suface. I am going to give it a try making my round pendant flat and using a slightly larger piece of glass over it. I do this for small earrings but haven't tried it for larger pieces.

I bought a pendant in Spain that was a domed circle and I have been trying to figure out how to do this.
Any ideas?