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