This is what I know. My grandfathers father acquired this in exchange for some booze and a Donkey when he was a teenager from a white guy. My Grandpa was born and raised in Mexico and came to the United States later in life. I know its more than 100 years old because its been in our family that long. Is this something you can help with? Its 2 faces carved into a huge what looks like a Garnet rock. I'm assuming its from South America. My great grandpa was in Mexico I think when he got it.

12x12x12x approx 40 lbs