Open Directory - Science:Earth Sciences:Geology:Rocks and Minerals:Gemstone

Top: Science: Earth_Sciences: Geology: Rocks_and_Minerals: Gemstone

Gemstones are generally regarded as: Polished fragments of 'precious' and 'semi-precious' minerals, used for decorative purposes.
Examples of Precious Stones: Diamonds / Sapphires / Rubies / Emeralds
Examples of Semi-Precious Stones: Topaz / Garnet / Spinels.
Examples of Other stones used as gems: Jade / Agate / Opal

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