Crystal glass is a type of glass that contains lead oxide, which gives it a higher refractive index and greater brilliance than regular glass. This composition allows crystal glass to sparkle and reflect light beautifully, making it a popular choice for fine glassware, decorative items, and luxury products. In addition to its aesthetic qualities, crystal glass is often more durable and has a distinct sound when tapped, known as the "ring." It is commonly used in the production of wine glasses, chandeliers, and figurines, enhancing both their visual appeal and overall quality.