Yellow crystal
Fire Opal
Amethyst crystals
Dendrites in agate
Raw garnet crystal
Aventurine
Citrine
Agate
Chalcedony
Citrine crystal group
Emerald
Tourmaline crystal, thin section
Carnelian
Smoky quartz
Concentric banding in agate
Lapis lazuli, SEM
Gneiss with garnet, light micrograph
Gneiss with garnet
Black tourmaline, SEM
Uncut emeralds
Quartz variety Citrine
Raw citrine crystal
Yellow-green Tourmaline rough
Almandine
Citrine crystals
Green calcite crystal
Calcite crystal
Tourmaline crystals in quartz
Quartz coated with silica
Quartz variation, Herkimer Diamonds
Moss agate
Quartz crystals
Cut Pyrope gemstone
Cut Watermelon Tourmaline gemstone
Rare bright green Uvarovite Garnet
Trillion cut tourmaline gemstone
Cut green Paraiba Tourmaline gemstone
Garnet
Cut Quartz gemstone
Amethyst gemstones
Opal gemstone
Rutile crystals
Citrine gemstones and crystal
Herkimer diamonds of quartz mineral
Citrine.
Quartz crystals, SEM
Quartz mineral stone
Quartz polished stone
Green Avanturine Quartz gemstone
Smokey Quartz gemstone
Milky Quartz gemstone
Dyed agate slice
Celestite crystals
Jasper
Specimen of rose quartz from Brazil
Banded texture in agate
Jasper breccia rock
Quartz crystal, SEM
Tourmaline gemstones in quartz
Amber citrine quartz stone
Amethyst
Amethyst geode
Garnet gemstone
Amethyst filled geode
Amethyst geode interior
Cursed amethyst
Amethyst crystals, light micrograph
Amethyst and chalcedony
Calcite
Brecciated jasper
Fortification agate
Quartz encrusted calcite crystals
Herkimer Diamond
Prehnite and okenite
Crackle quartz
Quartz crystal
Sample of feldspar
Schorl tourmaline crystal stone
Lapis lazuli crystals I
Lapis lazuli crystals II
Raw amethyst crystal
Quartz crystal mineral
Quartz crystal from Sentis, Switzerland.
Citrine gemstone
Citrine gemstones
Geode in thin section
Slice of agate
Zircon crystals on host rock
Twinned augite crystals
Tiger eye, polished surface
Tiger eye, thin section micrograph
Tiger eye, light micrograph
Sample of muscovite
Cut green Tourmaline gemstone
Cut pink Topaz gemstone
Tourmaline cross section
Amethyst geodes
Cut Kyanite gemstone
Rough pinkish-red Rubellite
Tourmaline
Tourmaline on quartz
Prismatic amethyst crystal
Amethyst, a quartz crystal
Rutilated quartz
Orange crystal
Cut pink topaz gemstone
Tourmaline unworked stones
Single amethyst crystal, close up
Large citrine gemstone
Herkimer diamonds
Cut yellow Vesuvianite gemstone
Pear cut citrine
Princess cut citrine
Oval cut Citrine
Round cut citrine
Oval cut citrine
Square emerald cut citrine
Asscher cut citrine
Citrine jewel
Citrine crystals, Rio Grande, Brazil
Hawk's Eye quartz stone
Granite specimen
Quartz and green tourmaline crystals
Polished carnelian stone
Polished tiger's eye stone