Citrine
Smoky quartz
Concentric banding in agate
Rose Quartz
Raw garnet crystal
Quartz coated with silica
Almandine
Rare bright green Uvarovite Garnet
Fire Opal
Quartz crystals, SEM
Quartz crystal, SEM
Twinned augite crystals
Gneiss with garnet
Tourmaline crystal, thin section
Citrine crystals
Opal gem necklace
Jade stone
Garnet gemstone
Amethyst filled geode
Amethyst geode interior
Amethyst and chalcedony
Prismatic amethyst crystal
Schorl and quartz crystals in groundmass
Zircon crystals on host rock
Calcite crystal
Calcite
Feldspar and quartz
Raw citrine crystal
Quartz encrusted calcite crystals
Amethyst crystals
Amethyst
Ruby in zoisite
Blue sapphire stone
Blue Sapphire uncut stone
Amethyst geode
Yellow crystal
Zinnwaldite mineral group
Emerald
Gneiss with garnet, light micrograph
Agate
Chalcedony
Tourmaline cross section
Tourmaline
Tourmaline on quartz
Rough pinkish-red Rubellite
Hawk's Eye quartz stone
Schorl tourmaline crystal stone
Tourmaline crystals in quartz
Cut Quartz gemstone
Carnelian
Axinite
Chrysocolla mineral
Beryl crystals
Tourmaline unworked stones
Uncut emeralds
Citrine crystal group
Iron oxide precipitation in agate
Smoky quartz crystals
Rose quartz mineral, artwork
Agate mineral rock cross section
Jasp agate stone
Jasp agate polished surface
Egyptian jasper stone
Botswana agate stones
Round agate geode
Round agate thunderegg
Two agate thundereggs
Agate slice
Blue lace agate
Botswana agate stone
Dyed agate slice
Moss Agate stone
Amethyst stone
Banded Amethyst stone
Beryl stone
Chalcopyrite
Chiastolite stone
Jasper polished stone
Cut and polished agate
Agate geode
Elbaite on albite and quartz
Prehnite and okenite
Ironstone matrix with potch opal
Quartz crystals
Lapis lazuli, SEM
Raw amethyst crystal
Tourmaline in quartz
Amethyst crystals, light micrograph
Calcite on amethyst
Tourmaline quartz
Heat-treated amethyst
Pallasite meteorite fragment
Pyrolusite in quartz
Citrine gemstones and crystal
Geode, thin section micrograph
Herkimer diamonds of quartz mineral
Kyanite
Cut Diopside gemstone
Cabuchon gemstones of jasper
Cut Pyrope gemstone
Yellow-green Tourmaline rough
Fluorite crystals on quartz, close up
Lapis lazuli crystals I
Lapis lazuli crystals II
Ruby crystal and gems
Mass of pyramid-shaped amethyst crystals
Single amethyst crystal, close up
Aventurine
Amethyst geodes
Dendrites in agate
Black tourmaline in mica schist
Andradite crystals
Almandine mineral sample
Olivine mineral sample
Nephrite crystals
Topaz crystals
Pyrope sand
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Garnet crystals on schist
Fire opal
Topaz specimens
Grossular crystals in host rock
Rough emeralds
Almandine crystals in schist
Pyrargyrite crystals
Spessartine garnet
Watermelon tourmaline
Grossular dodecahedral crystal
Elbaite mineral
Dravite mineral
Andradite mineral
Demantoid
Uncut diamonds
Peridotite
Garnet in peridotite
Topaz crystal in albite and microcline
Emerald crystal, close up
Olivine peridot crystal, close up