antique cameo - roman helmet

Who should I find locally to be able to tell me more about the materials and value of my cameo? I believe it could possibly be of the late victorian era due to the subject matter being Greek looking with a roman type of helmet. It may be of Athena. Not sure how to tell it's materials though. Would any jeweler be able to tell me that or do I need to find someone who specializes in that?

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