I had some clear acrylic stamps made recently for my imaginary future clothing brand, Circle "A". Two out of the three work pretty well. For the rounded diamond logo the acrylic material pools the ink, so it doesn't print as a solid color. I've read that using a fine grain sandpaper to rough up the surface may help. Still need to experiment with different inks too. For my next logo stamps I'll probably spend a little more and go for the more traditional red rubber stamp.