Recently I found these nifty little tweezers and they have made the handling of small triangular shaped pieces of glass and tile a breeze.
No more flying glass bits and no more frustration of trying to get the tweezers exactly on a triangle point. That point is at home nestled in the curve of the tweezers!
I found these on eBay, but there may be other sources. Mine were called "Bead Handling Tweezers" and their intended purpose is ease of picking up just that one particular bead you need from a tray or jar. Works just as beautifully for selecting just the right triangle for your mosaic art work in progress.