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