I'm having some trouble getting a good slice and print. Initial attempt using Cura and Ultimaker ended up with very little blue visible on the stone. It seems the cutout in the stone for the blue is too shallow. After merging, only about one layer of blue is in front of the stone, a bunch is behind, and then there are interwoven layers. I've posted a pic of the bottom half of my print. (it failed there for unrelated adhesion reasons)
I also tried slicing with Simplify3D, but that seemed to do the same thing.