The crystal sold by Swarovski is actually glass. Swarovski is a world-famous jewelry manufacturer. Swarovski produces a variety of crystals with exquisite workmanship and low price. It can be said that it is widely loved by girls. In fact, the crystal sold by Swarovski is glass. Dr. Wu Ruihua, a gem expert in China, pointed out in the article "Visual Identification of Crystals and Crystal Imitations" that Swarovski crystal is a kind of high-quality lead glass produced by an Austrian company called Swarovski. This has nothing to do with crystals. Lead glass is a kind of glass made by melting quartz sand and adding lead oxide (PbO) after chemical treatment. It is often used to replace rock crystals and is called "crystal", "artificial crystal" and "crystal glass".