I picked this up on the 1/2 off day at the Salvation Army, so I paid $3.50 for it. When I looked up Ott Sterling, it said it was Vintage, anyone know anything about these? It's either glass or stone, but I'm not sure if it's Fire Opal, it's so red! Any input?

I found a bunch for sale on ebay, says it's a NM designer but not much else.

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