An independent source of knowledge for gemstone enthusiasts and professionals. The Gem or Scam Library offers factual, substantiated information about gemstones, minerals and trade names. Each article is compiled on the basis of scientific literature, practical experience and analysis – and helps you distinguish between natural, treated, synthetic and misnamed materials. Up-to-date information, without sales pitches – intended for anyone who values reliable knowledge. Always have the right information at your fingertips.