Jasper, 925 sterling pendant What is Jasper? Jasper is a variety of Chalcedony, which is a microcrystalline variety of Quartz.   JASPER STONE JEWELRY CARE & MAINTENANCE Here are some tips to keep your Jasper stone looking like new for years to come: Do's Clean using a warm, soapy water mixture with a soft cloth or a brush Store your Jasper in a different box from other stones  Don'ts Do not soak Jasper Do not expose the stone to prolonged heat Do not use harsh soap or chemicals for cleaning Do not use any mechanical cleaners such as ultrasonic cleaners or steam cleaners.