Brazillian Agate

i have a brazillian agate rock with a human mandibile in it whats it worth?

also how do i find someone to determine the age

I cant tell you its value, but go to a geological estimator and ask to have a carbon test done for an estimated date of formation. With that date, an accurate value will be easier to ascertain with the services of an experienced fossil valuator.

Brazilian Agate Gemstone Guitar Pick