Easy to use: 7-day digital timer with set-and-repeat function lets you schedule grinding and polishing sessions. This supports long, patient work to create beautiful gemstones at your own pace. Gemstones: Turns raw stones into polished gems, making any gemstone sparkle. This electric gemstone grinder is easy to operate and built for durability, allowing you to convert rough material into finished gemstones in a straightforward, enjoyable way. Quiet operation: Premium grinder with a durable motor. The leak-proof rubber cylinder reduces noise and is 75% quieter than other plastic models, making it suitable for home use and for kids crafts. Sturdy and durable: The roller set provides a stable structure, reliable performance, and a long service life. With the stone roller, you can easily process raw gemstones into polished gemstones. Use scenarios: - At home DIY jewelry projects, transforming small rough stones into polished components for rings, pendants, or display stones. - Classroom or maker space projects, enabling hands-on gem polishing with students in a safe, quiet setup. - Hobbyist gemstone polishing, supporting slow, methodical finishing of stones for personal collections or crafts.