Crystals p 18-19

Human-made Crystals

Natural crystals take a long time to form. People discovered that they can make crystals using special equipment. Human-made crystals cost 10-100 times less than nature made crystals. The first man-made crystals were made in 1837. Cubic Zirconia is a fake diamond. Only an expert can tell the difference between a real diamond and a cubic zirconia.