Bi-coloured tourmaline crystals
Verdite green tourmaline gemstone
Tourmaline gemstone
Blue tourmaline crystals
Quartz and green tourmaline crystals
Pink tourmaline crystals growing on mica
Tourmaline crystals
Tourmaline crystals in quartz
Tourmaline crystals in matrix
Tourmaline crystals on Albite
Tourmaline specimen
Tourmaline crystal
Tourmaline
Tourmaline gem, 365 carat
Tourmaline gemstones in quartz
Tourmaline gem
Watermelon tourmaline
Tourmaline gemstones
Tourmaline quartz
Tourmaline pegmatite
Tourmaline Pegmatite
Crystals of green toumaline and pink lepidolite
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline in quartz
Elbaite crystal, variety Tourmaline
Albite with Tourmaline
Tourmaline mica in slate
Tourmaline in gneiss rock
Elbaite mineral (tourmaline)
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Schorl tourmaline crystal stone
Tourmaline Crystals, Minas Gerais, Brazil
Schorl variety of Tourmaline, Namibia
Black tourmaline in mica schist
Schorl and quartz crystals in groundmass
Elbaite mineral
Tourmaline mineral, light micrograph
Green Tourmaline in Muscovite, Maine
Dravite mineral
Hawk's Eye quartz stone
Tourmaline crystals in quartzite
Schorl, the black variety of Tourmaline
Rubellite tourmaline pendant
Tourmaline embedded in feldspar rock
Blue opal gemstones
Opal mineral stone
Tourmaline crystal, thin section
Black tourmaline, SEM
Tourmaline crystal specimen
Tourmaline crystal specimens
Rubellite Tourmaline in Lepidolite Mica
Opal gemstones
Single piece of blue opal
Opal rock
Black opal gemstone
Yellow-green Tourmaline rough
Elbaite on albite and quartz
Graphic tourmaline, light micrograph
Polarized light experiments, 1847
Granite specimen
Mylonite, light micrograph
Cut Watermelon Tourmaline gemstone
Granitic pegmatite
Rubellite I
Rubellite II
Opal gemstone
Opal
Trillion cut tourmaline gemstone
Opal specimen
Cut green Paraiba Tourmaline gemstone
Opal in its host rock
Opal gem and rock
Fire opal
Opal surface
Opal on bedrock
Ironstone matrix with potch opal
Potch opal with smooth and rough surface
Opal gem necklace
Tourmaline schorl specimen
Boulder opal formation
Opal specimen and cut stone
Tourmaline on quartz
Tourmaline cross section
Schorl (black Toutmaline)
Opalised fossil
Fire Opal
紅電気石
電気石
オパール
Aquamarine crystal
Opal specimens
Amethyst crystals
Citrine crystals
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
Round polished Common Opal
Cut green Tourmaline gemstone
Mineral properties, 18th century
Tourmaline unworked stones
Mineral samples
Turquoise stones
Uncut diamond from Africa
Topaz gemstones
Asscher cut diamond gemstone
Pink diamonds
Moonstone gemstones
Turquoise gemstone
Turquoise
Topaz gemstone
Fire opal birthstone
Uncut diamonds
Aquamarine gems
Amethyst gemstones
Tourmaline in pegmatite host rock
Quartz crystals coated with pink topaz crystals
Aquamarine crystals
Malachite mineral stone
Rough pinkish-red Rubellite
Quartz crystals
Spessartite (garnet) crystals growing on albite
Grossular garnet crystals on rock surface
Yellow diamond
Garnet.
Citrine.
Tarquoise.
Diamond
Polished turquoise stone
Turquoise gemstones
Garnet gemstones
Orthoclase adenoma moonstone gemstone
Uncut emeralds
Moonstone.
Rough emerald
Emerald gemstones
Peridot gemstones
Three pieces of blue opal
'Black' opal cabochon specimen