These peridot button beads on a 15" strand are fantastic value. Each bead is around 3-4mm wide. They are very good quality with great, fresh, spring green colour.
Peridot is a gem-quality variety of olivine and is an idiochromatic gem. Peridot is one of the few gemstones that occur in only one color, an olive green. How much iron is in the stone affects the intensity of the green.