Pyrite Natural Round Bead Full Strand | 4mm | Silver | 100 Bead(s) |Silver Pyrite Round Bead Strand for Jewelry Making. Unique silver pyrite four millimeter round beads perfect for necklaces, earrings or pendants. Pyrite's metallic luster and pale brass yellow hue give it a superficial resemblance to gold, hence the well known nickname of fool's gold. The color has also led to the nicknames brass, brazzle, and Brazil, primarily used to refer to pyrite found in coal. The name pyrite is derived from the Greek (pyrits