Opal
Opal mineral stone
Opal gemstones
Opal rock
Blue opal gemstones
Single piece of blue opal
Black opal gemstone
Opal gem and rock
Opal gem necklace
Opal in its host rock
Ironstone matrix with potch opal
Potch opal with smooth and rough surface
Boulder opal formation
Opal specimen and cut stone
Fire opal
Opal on bedrock
Opal specimen
Round polished Common Opal
Opal gemstone
Opal specimens
'Black' opal cabochon specimen
Opal surface
Opalised fossil
Fire opal birthstone
Mineral samples
オパール
Fire Opal
Cut Fire Opal gemstone
Three pieces of blue opal
A cut and polished fire opal
Slice through fossilised wood revealing opal
Tourmaline specimen
Elbaite mineral
Tourmaline
Watermelon tourmaline
Dravite mineral
Tourmaline crystals in quartz
Schorl and quartz crystals in groundmass
Elbaite mineral (tourmaline)
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Hawk's Eye quartz stone
Schorl tourmaline crystal stone
Opal birthstone
Bi-coloured tourmaline crystals
Verdite green tourmaline gemstone
Black tourmaline in mica schist
Tourmaline gemstone
Rubellite tourmaline pendant
Elbaite on albite and quartz
Tourmaline embedded in feldspar rock
Asscher cut diamond gemstone
Pink diamonds
Tourmaline gem, 365 carat
Blue tourmaline crystals
Tourmaline gemstones in quartz
蛋白石
Limburgite
Granite specimen
Tourmaline crystal specimen
Tourmaline crystal specimens
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline gem
Tourmaline crystals in matrix
Elbaite crystal, variety Tourmaline
Schorl variety of Tourmaline, Namibia
Tourmaline crystals
Albite with Tourmaline
Tourmaline crystals on Albite
Tourmaline pegmatite
Tourmaline Pegmatite
Tourmaline crystal
Pink tourmaline crystals growing on mica
Quartz and green tourmaline crystals
Crystals of green toumaline and pink lepidolite
Tiger eye
Amethyst geode interior
Garnet
Lapis lazuli specimen
Imperial Jade streaked with green
Prismatic amethyst crystal
Olivine peridot crystal, close up
Grossular garnet crystals on rock surface
Five polished ruby gemstones
Citrine
Tourmaline crystals in quartzite
Mylonite, light micrograph
Tourmaline in quartz
Tourmaline mica in slate
Tourmaline in gneiss rock
Tourmaline gemstones
Tourmaline quartz
Quartz monzonite
Herkimer diamonds
Yellow-green Tourmaline rough
Tourmaline Crystals, Minas Gerais, Brazil
Green Tourmaline in Muscovite, Maine
Opal Bivalve fossil Coober Pedy Australia
Peridot
Nephrite crystals
Moonstone gemstones
Garnet-bearing rock
Amethyst filled geode
Topaz specimens
Spessartine garnet
Garnet gemstone
Illustrations of Indian diamonds
Topaz
Cursed amethyst
Grossular dodecahedral crystal
Andradite mineral
Demantoid
Uncut diamonds
Topaz crystal in albite and microcline
Emerald crystal, close up
Turquoise on rock surface, close-up
Jade stone
Garnet crystals on schist
Pyrargyrite crystals
Lapis lazuli
Mineral exploration drilling, Kenya
Mining core samples, Kenya
Jade sword handle
Metamorphic rock
Ruby in zoisite
Tremolite crystals
Jasper
Quartz boulder
Brecciated quartz
Jasper breccia rock
Rough diamond
Graphic tourmaline, light micrograph
Cut Watermelon Tourmaline gemstone
Tourmaline mineral, light micrograph
Sample of Labradorite
Andradite crystals
Almandine mineral sample
Olivine mineral sample