Tourmaline specimen
Tourmaline crystals in quartz
Elbaite mineral (tourmaline)
Verdite green tourmaline gemstone
Tourmaline crystal specimen
Tourmaline
Bi-coloured tourmaline crystals
Watermelon tourmaline
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Schorl tourmaline crystal stone
Tourmaline crystal specimens
Tourmaline gemstone
Tourmaline crystals
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline crystals in matrix
Elbaite crystal, variety Tourmaline
Schorl variety of Tourmaline, Namibia
Tourmaline embedded in feldspar rock
Elbaite mineral
Black tourmaline in mica schist
Tourmaline gem, 365 carat
Tourmaline gemstones in quartz
Blue tourmaline crystals
Hawk's Eye quartz stone
Dravite mineral
Schorl and quartz crystals in groundmass
Tourmaline Crystals, Minas Gerais, Brazil
Green Tourmaline in Muscovite, Maine
Tourmaline gem
Tourmaline pegmatite
Tourmaline Pegmatite
Tourmaline gemstones
Tourmaline crystal
Albite with Tourmaline
Tourmaline crystals on Albite
Quartz and green tourmaline crystals
Rubellite tourmaline pendant
Yellow-green Tourmaline rough
Elbaite on albite and quartz
Pink tourmaline crystals growing on mica
Tourmaline quartz
Schorl, the black variety of Tourmaline
Tourmaline in quartz
Tourmaline mica in slate
Tourmaline in gneiss rock
Cut Watermelon Tourmaline gemstone
Granite specimen
Rubellite Tourmaline in Lepidolite Mica
Crystals of green toumaline and pink lepidolite
Trillion cut tourmaline gemstone
Tourmaline crystals in quartzite
Tourmaline mineral, light micrograph
Cut green Paraiba Tourmaline gemstone
Black tourmaline, SEM
Tourmaline schorl specimen
Opal specimen
Blue opal gemstones
Opal specimen and cut stone
Opal mineral stone
Graphic tourmaline, light micrograph
Opal
Opal gemstones
Single piece of blue opal
Mylonite, light micrograph
Opal rock
Black opal gemstone
Opal gem necklace
Opal in its host rock
Opal gem and rock
Ironstone matrix with potch opal
Potch opal with smooth and rough surface
Cut green Tourmaline gemstone
Tourmaline on quartz
Round polished Common Opal
Boulder opal formation
Tourmaline crystal, thin section
Fire opal
Opal on bedrock
Lapis lazuli specimen
Polarized light experiments, 1847
Tourmaline cross section
Rough pinkish-red Rubellite
電気石
紅電気石
Opal gemstone
'Black' opal cabochon specimen
Opalised fossil
Granitic pegmatite
Mineral samples
Opal specimens
Imperial Jade streaked with green
Prismatic amethyst crystal
Olivine peridot crystal, close up
Grossular garnet crystals on rock surface
Five polished ruby gemstones
Tourmaline unworked stones
Rubellite I
Rubellite II
Asscher cut diamond gemstone
Pink diamonds
Cut Indicolite gemstone
Fire opal birthstone
Topaz specimens
Cursed amethyst
Demantoid
Emerald crystal, close up
Opal surface
Mineral properties, 18th century
Cut Fire Opal gemstone
Aquamarine gems
オパール
Tourmaline in pegmatite host rock
Tiger eye
Citrine
Amethyst geode interior
Garnet
Siderite mineral
Bloodstone specimen
Pyrargyrite crystals
Schorl (black Toutmaline)
Garnet.
Tarquoise.
Moonstone.
Fire Opal
Sherry Topaz
Cut Emerald gemstone
Quartz monzonite
Herkimer diamonds
Peridot
Nephrite crystals
Moonstone gemstones
Garnet-bearing rock
Jade stone
Amethyst filled geode
Garnet crystals on schist
Spessartine garnet
Garnet gemstone
Illustrations of Indian diamonds
Topaz
Grossular dodecahedral crystal
Andradite mineral
Uncut diamonds
Topaz crystal in albite and microcline
Turquoise on rock surface, close-up
Lapis lazuli
Mineral exploration drilling, Kenya