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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 "A"

Gemstone Crystal System Density Hardness Refractive index Treatments
trigonal 3.06 7.0-7.5 1.624-1.644 none known
monolinic 3.00 5-6 1.602-1.655 none known
orthorhombic 4.32-4.68 3.5 1.710-1.768 none known
microcrystalline 2.66 6.5-7.0 1.544-1.553 dying
hexagonal 2.55-2.65 5.5-6.0 1.523-1.529 one known
triclinic 2.96 3.5 1.550-1.641 none known
orthorhombic 3.72 8.5 1.746-1.755 none known
allaniteAllanite
monoclinic 3.40-4.20 6-7 1.640-1.828 none known
triclinic 2.57-2.77 6.0-7.0 1.527-1.590 none known
triclinic 2.56 7.0-7.5 1.522-1.530 none known

amberAmber

amorphous 1.08 2.0-2.5 1.54 heating, oiling, reconstitution

citrineAmblygonite

triclinic 2.9-3.11 5.5-6.0 1.578-1.636 none known

amethystAmethyst

hexagonal 2.66 7 1.544-1.553 heating alters to citrine

ametrineAmetrine

hexagonal 2.66 7 1.544-1.553 none known

ammoliteAmmolite

Aggregate 2.60-2.85 4.5-5.5 1.520-1.680 Opticon, Coating

andalusiteAnatase

tetragonal 3.82-3.97 5.5-6.0 2.488-2.564 none known

gemAndalusite

orthorhombic 3.2 7.5 1.63-1.64 none known

andesineAndesine

triclinic 2.66 6.0-6.5 1.542-1.562 diffused

apatiteApatite

hexagonal 3.2 5 1.63-1.64 heat

apophyliteApophyllite

tetragonal 2.40 4.5-5.0 1.535-1.537 none known

aquaAquamarine

hexagonal 2.72 7.5-8.0 1.577-1.583 heat

andalusiteAxinite

Triclinic 3.28 6.5-7.0 1.674-1.706 none known

azuriteAzurite

monoclinic 3.7-3.8 3.5-4.0 1.730-1.838 none known