Shops Cameo necklace/brooch

Product Name: Shops Cameo necklace/brooch
This cameo can be worn either as a necklace or a brooch it is beautiful either way I have tried to find out what it is worth but no luck google lens, Christie's in NY, Cameo lady in Cullman, Alabama and Jewelry store shops owners. I have found out that the brown stone is possibly volcanic ash and the metal around the stone is brass and Christie's in NY could only tell me that it wasn't worth 10,000 and jewelry store owners just said do not sell it until I find out what it is worth.