I have done it woth no metallic reinker, just regualr reinkers and it worked just fine.
Gallery at Splitcoaststampers
If you deiced to use metallic reinkers-they will smudge. To combat that, after doing the polished stone part, I used embossing powder and embossed-it added a bit of dimension to the bg, and sealed in the pigment ink so that it did not smear. Here is one I never uploaded (at least I couldn't find it in my gallery) that was embossed over the metallic reinker.