section_path: Materials and methods/Other gemstones
section_name: Other gemstones
paragraph_text: Other gemstones
  
  Many precious and semiprecious stones are used for jewellery. Among them are:
  
  Some gemstones (like pearls, coral, and amber) are classified as organic, meaning that they are produced by living organisms. Others are inorganic, meaning that they are generally composed of and arise from minerals.
  
  Some gems, for example, amethyst, have become less valued as methods of extracting and importing them have progressed. Some man-made gems can serve in place of natural gems, such as cubic zirconia, which can be used in place of diamonds.