The second category is precious metal ornaments, including gold, platinum and silver. The third category is pearl ornaments. The above three categories are classified as precious jewels. The fourth category is semi-precious stone ornaments, including: 1, opal, 2, amethyst, 3, topaz, 4, jadeite, 5, jadeite, 6, tourmaline, 7, garnet, 8, Blackstone, 9, opal, 10, coral. Among semi-precious stones, some high-quality ones, such as jadeite, black opal, amethyst and alexandrite, are not cheap.