This is a unique silver piece with a fabulous opal center, the other two small stones are possibly Jade. I am not sure if it was originally a brooch or a pendant, it does not have a pin, or a loop for hanging on a chain and it doesn’t appear to ever have had anything attached to it. The opal is quite stunning, although it has a couple of small chips on one edge you can see in the photos, there is a dark inclusion within the opal which adds to its beauty. It is hard to get a photo of all the reflective light that plays within it. I believe it to be a boulder opal or possibly a sun opal. Set in silver no hallmarks, but lovely designs. A rare and elegant piece, please ask any questions I’ll do my best, I’m not a jewelry expert.