Opal mineral stone
Opal rock
Black opal gemstone
Opal gemstones
Blue opal gemstones
Single piece of blue opal
Opal
Opal specimen
Fire opal birthstone
Opal gem necklace
オパール
Opal specimens
Opal specimen and cut stone
Opal gemstone
Opal gem and rock
Ironstone matrix with potch opal
Opal in its host rock
Potch opal with smooth and rough surface
Boulder opal formation
Three pieces of blue opal
Opal birthstone
Fire opal
Opal surface
Opal on bedrock
Round polished Common Opal
A cut and polished fire opal
Slice through fossilised wood revealing opal
Fire Opal
Mineral samples
Tourmaline gemstone
'Black' opal cabochon specimen
蛋白石
Opalised fossil
Verdite green tourmaline gemstone
Cut Fire Opal gemstone
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Schorl tourmaline crystal stone
Hawk's Eye quartz stone
Tourmaline gemstones in quartz
Bi-coloured tourmaline crystals
Elbaite mineral
Dravite mineral
Elbaite mineral (tourmaline)
Opal Bivalve fossil Coober Pedy Australia
Tourmaline gem, 365 carat
Tourmaline specimen
Blue tourmaline crystals
Malachite mineral stone
Raw tourmaline crystal
Tourmaline gemstones and crystal
Schorl and quartz crystals in groundmass
Tourmaline Pegmatite
Tourmaline gem
Tourmaline crystals in matrix
Tourmaline
Elbaite crystal, variety Tourmaline
Schorl variety of Tourmaline, Namibia
Tourmaline crystals
Albite with Tourmaline
Tourmaline crystals on Albite
Tourmaline pegmatite
Watermelon tourmaline
Tourmaline crystals in quartz
Tourmaline crystal
Pink tourmaline crystals growing on mica
Quartz and green tourmaline crystals
Crystals of green toumaline and pink lepidolite
Detail of brushed copper
Tourmaline mineral, light micrograph
Tourmaline in quartz
Tourmaline quartz
Black tourmaline in mica schist
Tourmaline mica in slate
Tourmaline in gneiss rock
Tourmaline gemstones
Tourmaline Crystals, Minas Gerais, Brazil
Green Tourmaline in Muscovite, Maine
紅電気石
電気石
Topaz gemstone
Limburgite
Turquoise stone
Schorl, the black variety of Tourmaline
Sapphire gemstone
Aquamarine gemstone
Elbaite on albite and quartz
Tourmaline embedded in feldspar rock
Rubellite tourmaline pendant
Polarized light experiments, 1847
Alexandrite stone
Rubellite Tourmaline in Lepidolite Mica
Granite specimen
Tourmaline crystal specimen
Tourmaline crystal specimens
Rubellite I
Rubellite II
Granitic pegmatite
Yellow-green Tourmaline rough
Quartz mineral stone
Jade stone
Mylonite, light micrograph
Tourmaline crystal, thin section
Black tourmaline, SEM
Tourmaline crystals in quartzite
Aquamarine gems
Citrine
Yellow diamond
Cut Watermelon Tourmaline gemstone
Polished turquoise stone
Obsidian mineral stone
Garnet.
Citrine.
Tarquoise.
Orthoclase adenoma moonstone gemstone
Moonstone.
Turquoise
Turquoise gemstone
Uncut diamonds
Quartz polished stone
Peridot
Garnet crystals on schist
Pyrargyrite crystals
Hawk's Eye
Tiger's Eye
Blue sapphire stone
Blue Sapphire uncut stone
Moonstone gemstones
Assortment of Gemstones
Un-cut diamonds
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Schorl (black Toutmaline)
Graphic tourmaline, light micrograph
Star rubies and sapphires
Uncut diamond from Africa
Star sapphire stone
Turquoise mineral
Aquamarine crystal
Topaz specimens
Diamond
Topaz gemstones
Turquoise gemstones
Garnet gemstones
Turquoise stones
Uncut emeralds
Rough emerald
Amethyst crystals
Emerald gemstones
Citrine crystals
Tiger eye
A diamond