Bi-coloured tourmaline crystals
Blue tourmaline crystals
Verdite green tourmaline gemstone
Raw tourmaline crystal
Tourmaline gemstone
Tourmaline crystals
Tourmaline crystals in matrix
Tourmaline crystals on Albite
Tourmaline crystals in quartz
Tourmaline specimen
Tourmaline
Quartz and green tourmaline crystals
Tourmaline gem, 365 carat
Tourmaline gemstones in quartz
Pink tourmaline crystals growing on mica
Tourmaline gem
Watermelon tourmaline
Tourmaline pegmatite
Tourmaline Pegmatite
Tourmaline crystal
Tourmaline gemstones and crystal
Elbaite crystal, variety Tourmaline
Albite with Tourmaline
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Schorl tourmaline crystal stone
Elbaite mineral (tourmaline)
Tourmaline Crystals, Minas Gerais, Brazil
Schorl variety of Tourmaline, Namibia
Tourmaline gemstones
Tourmaline quartz
Schorl and quartz crystals in groundmass
Crystals of green toumaline and pink lepidolite
Tourmaline in quartz
Tourmaline mica in slate
Tourmaline in gneiss rock
Elbaite mineral
Black tourmaline in mica schist
Green Tourmaline in Muscovite, Maine
Hawk's Eye quartz stone
Dravite mineral
Tourmaline mineral, light micrograph
Schorl, the black variety of Tourmaline
Rubellite tourmaline pendant
Tourmaline embedded in feldspar rock
Tourmaline crystals in quartzite
Opal mineral stone
Tourmaline crystal specimen
Tourmaline crystal specimens
Rubellite Tourmaline in Lepidolite Mica
Opal gemstones
Single piece of blue opal
Blue opal gemstones
Opal rock
Black opal gemstone
Yellow-green Tourmaline rough
Tourmaline crystal, thin section
Black tourmaline, SEM
Elbaite on albite and quartz
Granite specimen
Cut Watermelon Tourmaline gemstone
Polarized light experiments, 1847
Opal gemstone
Graphic tourmaline, light micrograph
電気石
紅電気石
Opal
オパール
Trillion cut tourmaline gemstone
Mylonite, light micrograph
Opal specimen
Granitic pegmatite
Cut green Paraiba Tourmaline 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
Tourmaline schorl specimen
Boulder opal formation
Opal specimen and cut stone
Rubellite I
Rubellite II
Fire opal birthstone
Amethyst crystals
Fire opal
Opal surface
Opal on bedrock
Spessartite (garnet) crystals growing on albite
Garnet.
Citrine.
Tarquoise.
Moonstone.
Yellow diamond
Topaz gemstone
Opal specimens
A cut and polished fire opal
Slice through fossilised wood revealing opal
Round polished Common Opal
Opalised fossil
Fire Opal
Uncut emeralds
Aquamarine crystal
Crystal of imperial topaz
Lapis lazuli, a rare, deep blue gemstone
Tourmaline on quartz
Schorl (black Toutmaline)
Cut green Tourmaline gemstone
Tourmaline cross section
Uncut diamond from Africa
Mineral samples
Aquamarine gems
Citrine crystals
Zaratite
Melanite
Amethyst, a quartz crystal
Malachite mineral stone
Hessonite
Grossular garnet crystals on rock surface
Rough pinkish-red Rubellite
ベージュの布上に置かれた花をモチーフにしたブローチ
Luxulyanite, thin section, LM
Turquoise stones
Topaz gemstones
Asscher cut diamond gemstone
Pink diamonds
Moonstone gemstones
Orthoclase adenoma moonstone gemstone
Turquoise gemstone
Uncut diamonds
Turquoise
Amethyst gemstones
Mineral properties, 18th century
Nephrite crystals
Pyrargyrite crystals
'Black' opal cabochon specimen
Three pieces of blue opal
Quartz crystals coated with pink topaz crystals
Aquamarine crystals
Spessartite crystals, Monroe, Connecticut