The Zircon Gemstone, is a naturally mined gemstone (not to be confused with Cubic zirconia). Zircon has a 7.5 on the Moh's Scale of Hardness. It is a good gemstone for use in pendants and earrings, it may be used in rings where the Zircon gemstone is protected from sharp blows. Clean your Zircon with warm, soapy water and a soft bristle brush. Avoid Hot water and household chemicals. Do not clean in a home ultrasonic machine. As with all gemstones, care should be taken to protect it from scratches and sharp blows.