Man made using fibre optic glass (also known as "Fibre Optic Beads"). These beads change hue as they capture and reflect light. This light reflection gives them a band running through the centre of the bead which resembles a cat's eye. Available in a wide range of colours, I currently stock yellow but will no doubt add further colours in the future.
This is a man made bead and should not be mistaken for Chrysoberyl.