Geology
From www.geology.com

Amazonite

Amethyst

Ametrine

Ammolite

Andalusite

Anyolite

Apatite

Aquamarine

Aventurine

Azurite

Azurmalachite

Beryl

  - Aquamarine

  - Emerald

  - Goshenite

  - Green Beryl

  - Heliodor

  - Morganite

  - Red Beryl

Benitoite

Birthstones

Bloodstone

Charoite

Chrysoberyl

Chrysoprase

Citrine

Cordierite

Diamond

  - Blue Diamonds

  - Brown Diamonds

  - Colored Diamonds

  - Green Diamonds

  - Lab-Grown

  - Red Diamonds

  - Yellow Diamonds

Dinosaur Bone

Diopside

Dryhead Agate

Emerald

Fire Agate

Fluorite

Gaspeite

Garnet

Gem Silica

Geodes

Goldstone

Goshenite

Green Beryl

Helenite

Heliodor

Hematite

Idocrase

Iolite

Iris Agate

Jade

Jadeite

Jet

K2 Granite

Kyanite

Labradorite

Lapis Lazuli

Lepidolite

Malachite

Maw Sit Sit

Moldavite

Moonstone
Morganite Nephrite
Opal
  - Boulder Opal
  - Cat's-Eye Opal
  - Common Opal
  - Ethiopian Opal
  - Fire Opal
  - Imitation Opal
  - Matrix Opal
  - Morado Opal
  - Opalized Wood
  - Opalite
  - Precious Opal
  - Synthetic Opal
Organic Gems
Palm Wood
Peanut Wood
Peridot
Petrified Wood
Pinolith
Polka Dot Agate
Prasiolite
Quartz
  - Amethyst
  - Ametrine
  - Aventurine
  - Citrine
  - Prasiolite
  - Rose Quartz
  - Smoky Quartz
  - Strawberry
Red Beryl
Rhodochrosite
Rhodonite
Rose Quartz
Ruby

Sapphire
  - Fancy Sapphire
Scapolite
Serpentine
Smithsonite
Smoky Quartz
Sodalite
Sonora Sunrise
Sphalerite
Sphene
Spinel
Spodumene
Strawberry Quartz
Strontium Titanate
Sugilite
Sunstone
Tanzanite
Tiger's-Eye
Tiffany Stone
Titanite
Topaz
  - Blue Topaz
Tourmaline
Turquoise
Turritella Agate
Unakite
Variscite
Vesuvianite
Wonderstone
Zircon
Zoisite