Fiber optic beads are made from telecommunications material that resembles cats eye stone. This material takes a dye while retainning it's flash.
Here I combined 6 mm yellow fiber optics (cat eye) beads, charcoal rice fiber optics beads, a 40 x 48 mm bright yellow 6 petal flower shell pendant as a focal point and a magnetic clasp. The necklace is 16" in length. Great flash in the fiber optic (cat'e eye) beads and great detail in the shell flower.