1800''s 12k gold lava cameo brooch

1800''s 12k gold lava cameo brooch

Antique lava carved cameo brooch set in 12k solid gold bezel. I believe the back îs mixed metal for a stronger hold. See acid test pictures. Tested with JSP. there are no markings. This is from my mother''s jewelry box.
**notice there is a Crack on right side of brooch, seen in pictures*

Please ask any and all questions as there are no returns.
I''m a nurse, single mother in a financial bind. Trying to liquidate what I can.
No reasonable offer refused.