The difference between crystal and glass

Is the crystal on the crystal chandelier real natural crystal, and what is the difference between crystal and glass?

The impression that crystal gives us is crystal clear, while the feeling that glass gives us is transparent. Because natural crystals are expensive, have many defects, are not suitable for batch use, and are seriously inadequate in resources, the crystals on modern crystal lamps are synthetic products, regardless of whether they are imported or domestically produced. It is composed of glass and part of metallic lead. When the content of lead in the glass reaches 24%, it can be called crystal in the sense. The role of lead is to make the glass more transparent, and the colorful light refracted by natural light. Also strong.