Is it really fossil sponge? It's possible. I picked this material up out of an old rockhound's collection and it had "fossil sponge" sharpied all over it. I can say with certainty that the material is metamorphic, perhaps a fuchsite and the orbs are a variant mineral. There is a chance indeed that this material is a fossil sponge but in my research into fossilized sea sponges I haven't seen anything like it.
The stones are 26mm wide and hang 38mm on hammered sterling silver wire.
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