Crystal is made by adding lead oxide to glass. The lead in crystal is what makes it sparkle and reflect colors more than plain glass. It also makes crystal heavier than glass. The higher the lead content, the better quality the crystal. In Europe, glass must contain at least 4% lead to be called crystal and in the US, glass must have at least 1% lead content. Swarovski crystal has at least 32% lead content.
Copyright © 1999-2015 Artbeads.com®, a Stores in Motion company. All Rights Reserved.