Imitation
To result something of a genuine article or natural gemstone or simulate it from any material that imitate by its color, the appearance of a natural gemstone. Imitation gemstone having wholly different physical properties and chemical composition, and hence distinguish from synthetic gemstone. Physical properties, which determine differences are hardness, specific gravity, refraction or double refraction, color dispersion, and dichroism. Imitation gemstones are known as called simultants, which are mostly made of glass, paste or strass, faience, porcelain, and plastics.
