It looks like a poor casting possibly from a mold taken from the original "cameo",very visible casting bubbles on the front. No idea what the...
https://www.asianart.com/articles/hoffman/index.html
I was thinking it could be jade/stone,but the photos weren't good enough to tell the difference of stone/metal. example .................
Possible Chinese short sword/dagger. Is the blade carved or wire inlay of a dragon and length of blade. Could post here,they usually know most...
I belonged to this club when we lived in Oregon,maybe someone there can help you..........
Your photo and name seems to point to location,Seattle area? you could try and contact one of the clubs in the area for advice......
The surface of the stone has been abraded and can't tell what it is.
Do you know where he acquired the stones? My father bought a number of stones as an investment in the 60's from magazine ads or some other...
Photo of the backside?
It's just missing a short piece of twisted wire.
Size?
https://www.google.com/search?q=opal+chips+in+resin+jewelry&client=firefox-b-1-d&sxsrf=ACYBGNTt6byrTy_J752a2ggoYmIGYjAWhg:1579137438712&source=lnms...
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