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Alphabetical Gemstone List
Click on a letter for a list of gems:

A| B| C| D| E| F| G| H| I| J| K| L| M| N| O| P| Q| R| S| T|U| V| W| X|Y |Z

Gemstones that begin with the letter "G"

Gemstone Crystal System Density Hardness Refractive index Treatments

gahnospinel
Gahnospinel

cubic 4.01 7.5-8.0 1.760 none known

garnet
Garnet

cubic 3.40 5.5-6.5 1.700-1.746 usually none; demantoid can be heated; lower quality garnets may be fracture filled

glass
Glass

amorphous 2.30-4.50 5 to 6 1.470-1.700 various coatings