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