Create Your Gemstone: Make any stone shine, polish everyday stones into dazzling gems, easy to operate and sturdy in design, this electric Gemstone grinder lets you turn rough stones into beautifully polished gems, fun and easy. Quieter: The premium grinder is built with a sturdy motor The leak-proof rubber barrel reduces noise, making it 75% quieter than other plastic models. Complete Mug Set: Contains everything you need to make polished gemstones, such as 4 grinding grates, real rough stones and a detailed full color study guide. Great gift for girls and boys Easy To Use: Simple instructions and one-touch gears make grinding gems easy and fun. Manage days per rollover cycle with one-touch timer and automatic shutdown, set it and forget it