Cut Indicolite gemstone
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Cut green Tourmaline gemstone
Cut Watermelon Tourmaline gemstone
Yellow-green Tourmaline rough
Cut Kyanite gemstone
Cut yellow Vesuvianite gemstone
Cut Quartz gemstone
Cut Cordierite (Iolite) gemstone
Cut Scapolite gemstone
Cut Zircon gemstone
Cut Spessartine gemstone
Cut pink Topaz gemstone
Cut pink topaz gemstone
Cut Diopside gemstone
Round cut red Andesine
Cut Pyrope gemstone
Rough pinkish-red Rubellite
Tourmaline
Tourmaline on quartz
Tourmaline cross section
Elbaite mineral (tourmaline)
Tourmaline crystal, thin section
Black tourmaline, SEM
Tourmaline unworked stones
Cut Scapolite round gemstone
Elbaite on albite and quartz
Indicolite tourmaline faceted stone
Elbaite mineral
Elbaite crystal, variety Tourmaline
Cut Red Spinel gemstone
Tourmaline in quartz
Tourmaline quartz
Tourmaline embedded in feldspar rock
Cut Peridot gemstone
Tourmaline in pegmatite host rock
Cut Fire Opal gemstone
Moss agate
Cut Aquamarine gemstone
Tourmaline gemstone
Fire Opal
Cut Ruby gemstone
Cut Sapphire gemstone
Oval cut Sphene gemstone
Cut yellow sapphire gemstone
Verdite green tourmaline gemstone
Square cut purple Amethyst gemstone
Cut Diaspore gemstone
Oval cut Apatite gemstone
Rare bright green Uvarovite Garnet
Emerald
Cut pink-violet Kunzite gemstone
Round cut mauve Spinel gemstone
Garnet
Cut Sphalerite gemstone
Concentric banding in agate
Gneiss with garnet, light micrograph
Gneiss with garnet
Almandine
Schorl and quartz crystals in groundmass
Tourmaline crystals in quartz
Mylonite, light micrograph
Black tourmaline in mica schist
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
Dravite mineral
Cut Rose Quartz gemstone
Rubellite I
Rubellite II
Bi-coloured tourmaline crystals
Lizardite in serpentine rock
Sample of feldspar
Prehnite and okenite
Lapis lazuli, SEM
Oval cut red Rhodochrosite gemstone
Chrysocolla mineral
Beryl crystals
Sample of muscovite
Quartz coated with silica
Axinite
Ruby in zoisite
Peridot pebble and mixed-cut peridot
Rose Quartz
Citrine
Tourmaline schorl specimen
Graphic tourmaline, light micrograph
Tourmaline Crystals, Minas Gerais, Brazil
Tourmaline crystals
Green Tourmaline in Muscovite, Maine
Rubellite
Rubellite crystals
Pallasite meteorite fragment
Agate
Chalcedony
Cushion cut diamond gemstone
Brilliant cut diamond gemstone
Raw garnet crystal
Pink beryl crystal, SEM
Zircon crystals on host rock
Aventurine
Uncut emeralds
Fluorite
Mineral properties, 18th century
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline Pegmatite
Tourmaline gem, 365 carat
Tourmaline gem
Tourmaline crystals in matrix
Schorl, the black variety of Tourmaline
Schorl variety of Tourmaline, Namibia
Rubellite Tourmaline in Lepidolite Mica
Albite with Tourmaline
Tourmaline crystals on Albite
Tourmaline gemstones
Tourmaline pegmatite
Tourmaline gemstones in quartz
Tourmaline mineral, light micrograph
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
Malachite and chrysocolla minerals
Colourful gemstones
Quartz crystals, SEM
Quartz crystal, SEM
Asbestos veins in serpentinite
Feldspar and quartz
Kyanite
Neptunite
Emerald cut diamond gemstone
Asscher cut diamond gemstone
Heart cut diamond gemstone
Pear cut diamond gemstone
Polarized light experiments, 1847