Yellow-green Tourmaline rough
Rough pinkish-red Rubellite
Cut Watermelon Tourmaline gemstone
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Cut green Tourmaline gemstone
Tourmaline cross section
Tourmaline
Tourmaline on quartz
Tourmaline crystal, thin section
Black tourmaline, SEM
Tourmaline unworked stones
Cut Indicolite gemstone
Tourmaline embedded in feldspar rock
Tourmaline gemstone
Verdite green tourmaline gemstone
Elbaite mineral (tourmaline)
Cut Pyrope gemstone
Fire Opal
Bi-coloured tourmaline crystals
Tourmaline specimen
Watermelon tourmaline
Tourmaline crystals in quartz
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Schorl tourmaline crystal stone
Rubellite tourmaline pendant
Tourmaline crystals in quartzite
Tourmaline crystal specimen
Tourmaline crystal specimens
Black tourmaline in mica schist
Emerald
Rare bright green Uvarovite Garnet
Tourmaline crystals
Graphic tourmaline, light micrograph
Elbaite crystal, variety Tourmaline
Lapis lazuli, SEM
Almandine
Gneiss with garnet, light micrograph
Gneiss with garnet
Tourmaline Crystals, Minas Gerais, Brazil
Green Tourmaline in Muscovite, Maine
Cut pink Topaz gemstone
Cut Kyanite gemstone
Cut yellow Vesuvianite gemstone
Hawk's Eye quartz stone
Granite specimen
Elbaite mineral
Dravite mineral
Elbaite on albite and quartz
Schorl and quartz crystals in groundmass
Mylonite, light micrograph
Cut Diopside gemstone
Tourmaline gem
Tourmaline crystal
Tourmaline gemstones
Tourmaline quartz
Tourmaline pegmatite
Tourmaline Pegmatite
Tourmaline schorl specimen
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline in quartz
Tourmaline gem, 365 carat
Tourmaline crystals in matrix
Albite with Tourmaline
Tourmaline crystals on Albite
Tourmaline gemstones in quartz
Tourmaline mineral, light micrograph
Tourmaline mica in slate
Tourmaline in gneiss rock
Blue tourmaline crystals
Garnet
Cut Cordierite (Iolite) gemstone
Cut Scapolite gemstone
Schorl variety of Tourmaline, Namibia
Rubellite Tourmaline in Lepidolite Mica
Quartz and green tourmaline crystals
Schorl, the black variety of Tourmaline
Pink tourmaline crystals growing on mica
Yellow crystal
Uncut emeralds
Citrine
Round cut red Andesine
Cut Quartz gemstone
Cut Zircon gemstone
Prehnite and okenite
Concentric banding in agate
Cut pink topaz gemstone
Raw garnet crystal
Ruby in zoisite
Cut Fire Opal gemstone
Crystals of green toumaline and pink lepidolite
Moss agate
Ironstone matrix with potch opal
Potch opal with smooth and rough surface
Cut Scapolite round gemstone
Zircon crystals on host rock
Rose Quartz
Opal
Cut Spessartine gemstone
Round polished Common Opal
Mineral properties, 18th century
Aventurine
Polarized light experiments, 1847
Granitic pegmatite
Rubellite I
Rubellite II
Opal gemstones
Blue opal gemstones
Opal specimens
Opal specimen
Single piece of blue opal
Opal mineral stone
Opal rock
Black opal gemstone
Sample of feldspar
Lizardite in serpentine rock
Tourmaline in pegmatite host rock
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 on bedrock
Mineral samples
Agate
Chalcedony
Pallasite meteorite fragment
blue apatite
Sample of muscovite
Axinite
Chrysocolla mineral
Beryl crystals
Quartz coated with silica
石板にシルクを三角に折りアクセサリーを配置
Lapis lazuli crystals I
Lapis lazuli crystals II
Barred olivine chondrule
Sherry Topaz
Cut yellow sapphire gemstone
Dendrites in agate
電気石
紅電気石
Peridot pebble and mixed-cut peridot