One metal sphere contrasts a string of celestial gemstones. Easy to wear, this stackable design stretches. Gemstone: Green Onyx (Semi-Precious). Our semi-precious gemstones are rare, ethically sourced and hand cut from naturally occurring materials, giving each individual stone its own unique color. Note: stone color per piece may vary. Metal: DD Signature Gold Plated Over High-Quality Brass. Bead Diameter: 0.3"/ 8mm Circumference: 8" / 20cm