See photos of rough and cut gemstones and learn about the chemistry of the minerals.
 Agate |  Amber |  Alexandrite |  Amethyst |
 Amethyst |  Amethyst |  Ametrine |  Aquamarine |
 Azurite |  Azurite |  Beryl Crystal Photo |  Beryl |
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Gemstone Photo Gallery
From Anne Marie Helmenstine, Ph.D., About.com
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