The best i can read is that the cameo stamp says P750. On the chain there is a 12k on silver stamp as well. There are initials on the back. The letters appear to be pa or po, the script is loopy and freehand. I do apologize for the delay but I had dropped it off with a friend.
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Quiet and Lovely Cameo Jewelry by: Anonymous
Hi there - I'm an avid cameo jewelry collector and also love to stalk flea marks in my spare time. Is the reverse of the cameo pendant necklace material a convex shape or flat surface? A Flat cameo surface on the reverse, usually means it's a fake if it's meant to be mimicking shell so this info will help you to eliminate this possibility - in my years of cameo hunting I've seen this kind of cameo used to shorten a row of pearls. Vintage Cameo Jewelry makes for classy evening jewelry accessories that generation Y ers, are starting to embrace, vintage costume jewelry is not only loved and worn by the Baby boomers - plus Cameo jewelry is a sustainable alternative to factory farmed jewelry. Shell cameo will become more rare and valuable as time goes by as most of the ocean corals are endangered now.
Can see some stamps on the base of the metal - can you read them? The mount may be old gold and the subject of head and shoulder profile, of yet another lovely young lady, however, this girl has a quite and demure loveliness about it.