Rhyolite in quartz is a beautiful crystal that contains rhyolite (limonite), which is known in Japanese as "brown iron ore." Rhyolite is a mineral formed by the oxidation of metallic mineral components, and it appears red, reddish-brown, or yellow. Rhyolite in quartz is formed when water containing such metallic mineral components enters the cracks in the crystal, and over a long period of time, the water evaporates and recrystallizes. This bracelet has beautiful red and orange rhyolite, making it gorgeous. I've arranged it in a beautiful gradation that makes you marvel at how diverse the colors can be when metallic mineral components are oxidized. Size: 8.5-9mm x 22 beads Inner Diameter: 16.5cm and up Made in Brazil