Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material
7. rock (inorganic material)
8. [rock by form]
9. stone (worked rock)

Narrower term/s

• birthstone
• gemstone[+]
  • semiprecious stone
  • precious stone (material)
  • [gemstones by specific type] [+]
    • apatite [NP]
    • beryl [NP] [+]
      • aquamarine (mineral)
      • emerald (mineral)
      • golden beryl
      • morganite
    • aquamarine (mineral) [NP]
    • emerald (mineral) [NP]
    • morganite [NP]
    • corundum [NP] [+]
      • emery
      • ruby (mineral)
      • sapphire (mineral)
    • ruby (mineral) [NP]
    • sapphire (mineral) [NP]
    • diamond (mineral) [NP] [+]
      • industrial diamond
      • treated diamond
      • rough diamond
    • epidote [NP]
    • feldspar [NP] [+]
      • plagioclase [+]
      • alkali feldspar [+]
      • anorthite
    • moonstone [NP]
    • orthoclase [NP] [+]
      • moonstone
    • garnet (mineral) [NP] [+]
      • gadolinium gallium garnet
      • andradite [+]
      • almandine [+]
      • rhodolite
      • yttrium-aluminium-garnet
    • hematite (mineral) [NP]
    • marcasite [NP]
    • pyrite [NP]
    • jade (rock) [NP] [+]
      • nephrite [NP]
      • jadeite [NP] [+]
    • nephrite [NP]
    • jadeite [NP] [+]
      • ayah kyauk
    • lapis lazuli (rock) [NP]
    • malachite (mineral) [NP]
    • opal [NP]
    • quartz (mineral) [NP] [+]
      • amethyst (mineral)
      • chalcedony [+]
      • chert [NP] [+]
      • quartz crystal
      • aventurine (quartz)
      • rose quartz
      • citrine
      • cristobalite
    • amethyst (mineral) [NP]
    • chalcedony [NP] [+]
      • agate (chalcedony) [+]
      • onyx (mineral) [+]
      • bloodstone
      • chrysoprase
      • jasper
      • carnelian
      • sard
    • agate (chalcedony) [NP] [+]
      • moss agate
    • onyx (mineral) [NP] [+]
      • sardonyx
    • sardonyx [NP]
    • bloodstone [NP]
    • chrysoprase [NP]
    • jasper [NP]
    • aventurine (quartz) [NP]
    • rose quartz [NP]
    • topaz (mineral) [NP] [+]
      • Brazilian ruby (mineral)
    • tourmaline [NP]
    • turquoise (mineral) [NP]
    • zircon [NP] [+]
      • hyacinth (zircon)
    • hyacinth (zircon) [NP]
    • serpentine (mineral) [NP] [+]
      • chrysotile
      • antigorite
      • bowenite
      • lizardite
    • jet (coal) [NP]
    • meerschaum [NP]
    • carnelian [NP]
    • olivine [NP] [+]
      • peridot (mineral)
    • lazurite [NP]
    • sard [NP]
    • azurite (mineral) [NP]
    • peridot (mineral) [NP]
    • prasine (mineral or pigment) [NP]
    • red coral (material)
    • cubic zirconia [NP]