Gauge:2g(6mm),0g(8mm),00g(10mm),1/2"(12mm),9/16"(14mm),5/8"(16mm) Diameter:(approx)7mm,9mm,11mm,13mm,15mm,17mm Height:(approx)10mm Material:Stone Quantity:4 Pair(at same size) These natural stones and stones with synthetic treatment are hypoallergenic. They will not cause infection even though your skin is rather sensitive. Besides decorating your body,they are good to human¡¯s health,like reinforcing the memory,relieving insomnia etc. Please be advised that there may be some variance in color and tone,due to the Product being made from raw,natural materials.The color will be different as picture showed.