Polarized light experiments, 1847
Tourmaline gemstone
Verdite green tourmaline gemstone
Bi-coloured tourmaline crystals
Graphic tourmaline, light micrograph
Tourmaline
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline crystal, thin section
Black tourmaline, SEM
Tourmaline crystals in quartz
Tourmaline in quartz
Tourmaline gem, 365 carat
Tourmaline gem
Tourmaline crystals in matrix
Schorl, the black variety of Tourmaline
Tourmaline Crystals, Minas Gerais, Brazil
Elbaite crystal, variety Tourmaline
Schorl variety of Tourmaline, Namibia
Tourmaline crystals
Rubellite Tourmaline in Lepidolite Mica
Green Tourmaline in Muscovite, Maine
Albite with Tourmaline
Tourmaline crystals on Albite
Black tourmaline in mica schist
Tourmaline gemstones in quartz
Tourmaline mineral, light micrograph
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Hawk's Eye quartz stone
Schorl tourmaline crystal stone
Granite specimen
Rubellite tourmaline pendant
Tourmaline crystals in quartzite
Tourmaline crystal specimen
Tourmaline crystal specimens
Tourmaline specimen
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 gemstones
Tourmaline quartz
Granitic pegmatite
Tourmaline pegmatite
Elbaite on albite and quartz
Yellow-green Tourmaline rough
Schorl and quartz crystals in groundmass
Tourmaline Pegmatite
Tourmaline embedded in feldspar rock
Elbaite mineral (tourmaline)
Mylonite, light micrograph
Cut Watermelon Tourmaline gemstone
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Rubellite I
Rubellite II
Opal gemstones
Blue opal gemstones
Opal specimen
Single piece of blue opal
Opal mineral stone
Opal rock
Black opal gemstone
Mineral properties, 18th century
Opal specimens
電気石
紅電気石
Tourmaline schorl specimen
Tourmaline on quartz
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
石板にシルクを三角に折りアクセサリーを配置
Schorl (black Toutmaline)
Luxulyanite, thin section, LM
オパール
Tourmaline cross section
Cut green Tourmaline gemstone
Opal gemstone
Opal
Opal gem necklace
Opal in its host rock
Boulder opal formation
Opal gem and rock
Opal specimen and cut stone
Fire opal
'Black' opal cabochon specimen
Opalised fossil
Opal surface
Opal on bedrock
Ironstone matrix with potch opal
Potch opal with smooth and rough surface
Mineral samples
Round polished Common Opal
Cut Fire Opal gemstone
Fire Opal
Fire opal birthstone
Cut Indicolite gemstone
Tourmaline unworked stones
A cut and polished fire opal
Three pieces of blue opal
Slice through fossilised wood revealing opal
19th-century diamond mining, Brazil
Opal birthstone
Moonstone gemstones
蛋白石
Aquamarine gems
Garnet.
Citrine.
Tarquoise.
Moonstone.
Amethyst crystals
Diamond
Polished turquoise stone
Diamonds
Topaz gemstones
Emerald gemstones
Turquoise gemstones
Turquoise gemstone
Precious gemstones
Garnet gemstones
Uncut diamonds
Turquoise stones
Turquoise specimen and polished stone
Rough emerald
Turquoise mineral
Malachite mineral stone
Moonstones
Turquoise stone
Sapphire gemstone
Orthoclase adenoma moonstone gemstone
Topaz gemstone
Aquamarine gemstone
Turquoise
Uncut emeralds
Citrine crystals
Yellow diamond
Synthetic diamond film production
Diamond theft reward poster, April 1965