Introduction to the Gem Hall: The Gem Hall mainly displays four parts: gemstones, jade, organic gemstones and precious metals for jewelry: the gemstone section introduces diamonds, emeralds, rubies and sapphires, which are known as the four famous treasures. Various types of medium and low-end gemstones, as well as the differences between Chinese and Western gemstone cultures; the jade section introduces the varieties, applications and evaluations of jade in the broad sense and the narrow sense; the organic gemstone section introduces the types and applications of organic gemstones; and the precious metals for jewelry section introduces Various commonly used precious metal materials and processing techniques are covered.