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	cubic	4.01	7.5-8.0	1.760	none known
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	amorphous	2.30-4.50	5 to 6	1.470-1.700	various coatings