I purchased this cameo from an estate. From what I know it is sardonynx. The carving depicts Mars riding a chariot on some clouds. When held up to the light it appears reddish brown. There are no cracks or hairlines. I had it tested by a reputable jeweler and it tests 14k and is surrounded by approx. .80ctw diamonds. The pin back appears old C-type hook. The pin looks almost as if it were forged not soldered. The only marking I could find looks to be a capital AP at the base of the pin back. So what do you think? I'll try and send a few photos. Thanks.
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