Here are some of the results I got. The two on the left are Curly Maple and Cocobolo with dyed wood veneer. The other one is all Tru-Stone with homebrew PR for the black.
I had no problems at all cutting the Tru-Stone.
I would recommend this saw in a heartbeat for small precision work like pen blanks. It is a joy to use.
Any chance you could post pictures of what the pen blanks above turned out to look like? They're beautiful!