It is lead crystal, to be precise, with the same silica that goes into regular glass, but 24 % lead oxide by content, which yields a higher refractive index and creates an attractive sparkling effect. These properties make lead crystal a popular material for the crafting of imitation jade.
它的材質是「水晶玻璃」，與普通玻璃一樣都含二氧化矽，但因額外添加了 24％的氧化鉛，因此折射出來的光澤更為明亮，常作為鑄造仿玉藝品的材料。