Check for 14k or 18k gold stamps . A silver or base-metal frame significantly lowers the value.
If you'd like, I can help you of your brooch. Do you know: cameo brooch worth
What the is (e.g., a woman's profile, a scene, or a person with jewelry)? Vintage Cameo Brooch Value: How to Get an Appraisal Check for 14k or 18k gold stamps
$5,000+ (rare materials, artist signatures, or intricate museum-quality carving). Key Factors for High Value a woman's profile