Quote Originally Posted by JoshEarl View Post
You could get a combo blue/yellow and be pretty much set.
I have one, simply because the shop I bought it in sold them for the same price as the slate backed ones. I think that it was an accident they had it in the first place.

Anyhow, natural combos are beautiful but there are 2 things worth pointing out:
1) natural combos are more expensive than one separate yellow and blue stone together.
2) you can use separate stones alongside each other, whereas you have to turn over a combo stone if you want to switch. Potential issues here are slurry contamination and the fact that you can have crud / lint /... hangin to the side that the combo was lying on earlier.