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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 "O"

Gemstone Crystal System Density Hardness Refractive index Treatments

onyx Onyx

micrcrystalline 2.65 7.0 1.564-1.660 dying, filling

opal Opal

amorphous 2.15 5.0-6.5 1.450 fracture filling