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Depending on the definition of precious stone/gems, in increasing order of hardness, there are:

  1. Coral
  2. Rhodochrosite (national gemstone of Argentina)
  3. Apatite
  4. Sphene
  5. Opal
  6. Lazulite
  7. Turquoise
  8. Feldspars

At the top end of things there are:

  1. Emerald
  2. Topaz
  3. Cubic Zirconia
  4. Ruby/Sapphire
  5. Diamond
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11y ago

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