Views: 2 Author: Site Editor Publish Time: 2020-06-08 Origin: Site
In gemology, gemstones are generally divided into precious gemstones and semi-precious stones. There are four main types of precious stones, namely diamonds, rubies, sapphires and emeralds, while the rest of the stones, such as crystal, agate and carnelian, are semi-precious stones. The main semi-precious stones are: tourmaline, crystal, Xiuyan jade, lapis lazuli, topaz (topaz), sea sapphire, garnet, olivine, tiger eye stone (wood stone), labradorite (moonstone), star stone, Obsidian, malachite, turquoise, red jasper, purple dragon crystal, Green aventurine, fluorite, agate, chalcedony, Czech meteorite, opal, Sodalite, calcite and so on. In addition, organic gemstones, amber, pearls, and corals are also classified as semi-precious stones.