Question: what is the difference between crystal and cubic zirconia?
Answer: High-grade crystal, such as Swarovski, are usually made of silicon dioxide combined with trace amounts of lead. A cubic zirconia is always a man-made stone made mostly of zirconium dioxide with yttrium, magnesium, and calcium. ... A crystal is typically a hardness scale of 6 whereas a cubic zirconia ranges from an 8 to 9.