A semi-precious gemstone is any gemstone that is not a diamond, ruby, emerald, or sapphire. The term "semi-precious" gemstone does not imply that it is less valuable than precious gemstones. Semi-precious gemstones are simply more plentiful (but there are a few exceptions). Semi-precious gemstones are valued primarily based on their colour, availability, and consistency. The terms "semiprecious stones" and "semi-precious stones" refer to all gemstones that are not classified as "precious." Any gemstone that can be used for personal adornment will be included. Semiprecious stones include gemstones crafted from agate, amber, amethyst, aquamarine, aventurine, chalcedony, chrysocolla, chrysoprase, citrine, garnet, hematite, jade, jasper, jet, kunzite, lapis lazuli, malachite, moonstone, obsidian, onyx, peridot. Some people claim that the term "semiprecious" is insulting, provocative, deceptive, or ambiguous and should be phased out. They believe that "precious stones" and "other stones" should be separated. But it will be tremendously difficult to get rid of the term "semiprecious Hundreds of famous books with the term "semiprecious" in their titles have been published over the last 150 years. Today, the word can be found in thousands of books, journals, websites, and other documents written by gem and jewellery firms, government agencies, and essential gemological institutions.