Diamonds
Cut and polished diamonds
Diamond
Crushed diamond, SEM
Diamond gemstones
Microdiamond crystal
Microdiamond crystal, SEM
Cullinan diamond replica
Synthetic diamond film production
Synthetic diamond film
Diamond in kimberlite
Pre-cut diamond forms
Diamond cleaning
Cut diamond
Carbon
Uncut diamonds
Sylvanite crystals
Herkimer diamonds of quartz mineral
Chiastolite section
Diamond in host rock
Uncut diamond
Diamond with garnet inclusion
Graphite on calcite crystals
Pink diamonds
Humphry Davy (1778-1829), English chemist
Ruby
Large citrine gemstone
Ironstone matrix with potch opal
Unpolished topaz crystals
Sapphire crystal
Asscher cut diamond gemstone
Uncut diamond from Africa
Pyritohedral crystals, close up
Pyrite
Chalcopyrite and quartz crystals
Amethyst
Citrine
Tourmaline
Rough diamonds
Quartz variation, Herkimer Diamonds
Illustrations of Indian diamonds
Diamonds under UV light
Yellow diamond
Turquoise mineral
Rubies and sapphire
Factory worker selecting diamonds, Angola
Sulphur crystals
Apophyllite crystals
Apophyllite on calcite
Tetrahedrite
Raw amethyst crystal
Raw citrine crystal
Raw garnet crystal
Raw tourmaline crystal
Tourmaline gemstones and crystal
Topaz crystal in albite and microcline
Emerald crystal, close up
Prismatic amethyst crystal
Mass of prismatic aquamarine crystals
Mass of pyramid-shaped amethyst crystals
Olivine peridot crystal, close up
Heat-treated amethyst
Elbaite on albite and quartz
Single amethyst crystal, close up
Mineral samples
Grossular garnet crystals on rock surface
Schorl and quartz crystals in groundmass
Peridot gemstone
Tourmaline Pegmatite
Tourmaline embedded in feldspar rock
Elbaite mineral (tourmaline)
Andradite, New Jersey
Tourmaline in quartz
Amethyst geode
Calcite on amethyst
Tourmaline quartz
Opal
Lazurite crystals in a matrix of calcite
Amethyst crystals
Tourmaline crystal, thin section
Citrine crystals
Tourmaline crystals in quartz
Black tourmaline in mica schist
Andradite crystals
Almandine mineral sample
Olivine mineral sample
Garnets in micaschist, light micrograph
Nephrite crystals
Tremolite crystals
Topaz crystals
Pyrope sand
Blue sapphire stone
Blue Sapphire uncut stone
Opal gem necklace
Jade stone
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Hawk's Eye quartz stone
Schorl tourmaline crystal stone
Amethyst geodes
Garnet gemstone
Amethyst filled geode
Clinochlore with garnets
Ruby crystal and gems
Garnet crystals on schist
Rubellite tourmaline pendant
Uvarovite garnet crystals
Fire opal
'Black' opal cabochon specimen
Orange sapphire gemstone
Topaz gemstone
Wollastonite with kolophonite
Pyrargyrite crystals
Topaz specimens
Opalised fossil
Grossular crystals in host rock
Rough emeralds
Almandine crystals in schist
Tourmaline crystals in quartzite
Amethyst geode interior
Tourmaline crystal specimen
Tourmaline crystal specimens
Spessartine garnet
Watermelon tourmaline