Even if you had to split a large boulder, when the boulder is set on the ground, no one knows that it has a flat bottom. Take one large boulder, split , and sell as two.
Same size diameter at base
Someone makes a products that you bore several holes into the stone/boulder, and add some compound, and let it sit, and the chemical action causes the material to expand, and the stone/boulder is split.
Here is the stuff I am talking about.
Western Blasting Technologies
Chemical Demolition Agent: Non-Explosive Concrete Demolition
Betonamit, or S-Mite, Bristar