Three Stone Opal Studs are perfect for stacking or for that sweet minimalist look! * Made of 925 Sterling Silver * We use a THICK, DURABLE plating of 14K Gold, Rose Gold or Rhodium - for a piece that will last you years to come! * Made of lab created opals - we use the highest grade for an authentic look! * Nickel-free & Hypoallergenic * Dimensions: 4.5mm * Also available in White Cubic Zirconia and Turquoise.