I am using a 70/30 n tane/propane mix. I dont really like it for diamonds though. All of my lids bulge at room temp. Going to switch to 100 n tane when its time to clean and refill my solvent tank.
I dont really know that it would be possible to go the route you want with N tane. Definitely possible with pentane. I think in Post Your THCA Pics/Vids either J12 or Diamond alchemy has a very large stone grown from when he cleans or something.