Tourmaline
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Elbaite mineral (tourmaline)
Tourmaline gemstone
Verdite green tourmaline gemstone
Tourmaline specimen
Watermelon tourmaline
Cut Watermelon Tourmaline gemstone
Yellow-green Tourmaline rough
Tourmaline crystals in quartz
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Schorl tourmaline crystal stone
Rubellite tourmaline pendant
Tourmaline crystal specimen
Tourmaline crystal specimens
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline embedded in feldspar rock
Amethyst gemstones
Peridot gemstones
Cut green Tourmaline gemstone
Elbaite on albite and quartz
Tourmaline crystals in quartzite
Black tourmaline in mica schist
Tourmaline gemstones
Bi-coloured tourmaline crystals
Cut Fire Opal gemstone
Schorl and quartz crystals in groundmass
Hawk's Eye quartz stone
Granite specimen
Elbaite mineral
Dravite mineral
Graphic tourmaline, light micrograph
Tourmaline gem
Tourmaline crystals
Tourmaline pegmatite
Tourmaline Pegmatite
Mylonite, light micrograph
Tourmaline gem, 365 carat
Tourmaline crystals in matrix
Elbaite crystal, variety Tourmaline
Albite with Tourmaline
Tourmaline crystals on Albite
Tourmaline gemstones in quartz
Blue tourmaline crystals
Tourmaline schorl specimen
Diamond ring
Diamond necklace
Diamonds
Tourmaline Crystals, Minas Gerais, Brazil
Schorl variety of Tourmaline, Namibia
Rubellite Tourmaline in Lepidolite Mica
Green Tourmaline in Muscovite, Maine
Opal
Schorl, the black variety of Tourmaline
Tourmaline quartz
Tourmaline crystal
Tourmaline in quartz
Tourmaline mineral, light micrograph
Tourmaline mica in slate
Tourmaline in gneiss rock
Tourmaline crystal, thin section
Black tourmaline, SEM
Quartz and green tourmaline crystals
Cut Indicolite gemstone
Tourmaline on quartz
Pink tourmaline crystals growing on mica
Tourmaline cross section
Citrine gemstones
Rough pinkish-red Rubellite
Mineral samples
Round polished Common Opal
Tool holding amethyst gemstone
Amethyst gemstones and crystal
Diamond
Diamonds and diamond ring
Tool holding diamond
Emeralds
Diamonds and gemology tools
Diamonds on a scoop
Diamonds and aquamarine gemstones
Moonstone
Moonstones
Mystic topaz gemstone
Crystals of green toumaline and pink lepidolite
Rubies
Ironstone matrix with potch opal
Potch opal with smooth and rough surface
Opal gem necklace
Opal in its host rock
Boulder opal formation
Opal gem and rock
Opal specimen and cut stone
'Black' opal cabochon specimen
Polarized light experiments, 1847
Tourmaline unworked stones
Amethyst gemstone
Citrine gemstone
Colourful gemstones
Opal gemstones
Opal specimen
Opal mineral stone
Opal rock
Black opal gemstone
Single piece of blue opal
Fire opal
Opalised fossil
Opal on bedrock
Square cut purple Amethyst gemstone
Cut Ruby gemstone
Cut Sapphire gemstone
The Centenary Diamond
Diamonds under UV light
Mineral properties, 18th century
Citrine gemstones and crystal
Granitic pegmatite
Cut yellow sapphire gemstone
Blue opal gemstones
Opal specimens
紅電気石
Tweezers holding alexandrite gemstone
Aquamarine gemstones
Aquamarine gemstones and crystal
Tanzanite
Diamond grading certificate
Tourmaline in pegmatite host rock
Trillion cut diamond
Blue rectangular gemstone
Cut Pyrope gemstone
Cut Peridot gemstone
Garnet
Sapphires
Rubellite I
Rubellite II
Pink gemstone in the shape of heart
Pink gemstones in the shape of heart
Round cut mauve Spinel gemstone
Purple rectangular gemstone
Pink rectangular gemstone
Red rectangular gemstone
Opal gemstone
Alexandrite gemstone
電気石
Cut Aquamarine gemstone