"Bought one on spec to see if it would fit my 12mm beads. It didn't - at first. It was too small and sat on top of the bead like a hat. However, because the walls are quite thin I was able to press the cap down onto the bead, enlarging it somewhat. It now fits much more closely to the surface of the bead - not perfectly, but close enough that it's hard to tell. It's quite a bright, white silver colour in person."