Oval polished Smithsonite
Smithsonite
Smithsonite encrustation
Polished oval Hawk's Eye Quartz
Smithsonite, an ore of Zinc
Oval polished Onyx
Oval polished green Chrysoprase
Smithsonite, a minor ore of Zinc
Oval cut Sphene gemstone
Oval cut Apatite gemstone
Moonstone
Oval cut red Rhodochrosite gemstone
Blue smithsonite in groundmass
Round polished Common Opal
Oval Sunstone gemstone
Cut Sphalerite gemstone
Polished Chrysocolla cabochons
Diamond
Colourful gemstones
Round cut mauve Spinel gemstone
Cut Cordierite (Iolite) gemstone
Cut Scapolite gemstone
Malachite, Zaire
Opal
Labradorite sunstone
Turquoise gemstone
Larimar, polished stones
Amethyst gemstone
Mystic topaz gemstone
Round cut red Andesine
Tool holding amethyst gemstone
Tweezers holding alexandrite gemstone
Pink gemstone in the shape of heart
Pink gemstones in the shape of heart
Purple rectangular gemstone
Pink rectangular gemstone
Red rectangular gemstone
Emeralds
Peridot gemstones
Smithsonite, Choix, Sinaloa
Alexandrite gemstone
Citrine gemstone
Blue rectangular gemstone
Amethyst gemstones
Amethyst gemstones and crystal
Aquamarine gemstones
Aquamarine gemstones and crystal
Diamonds
Diamonds and diamond ring
Tool holding diamond
Diamond ring
Diamond necklace
Diamonds and gemology tools
Diamonds on a scoop
Diamonds and aquamarine gemstones
Moonstones
Tanzanite
Tourmaline
Wedge shaped titanite crystal
Cut Diaspore gemstone
Cut yellow Vesuvianite gemstone
Square cut purple Amethyst gemstone
Cut Fire Opal gemstone
Cut Red Spinel gemstone
Cut Ruby gemstone
Cut Sapphire gemstone
Pieces of red spinel
The Centenary Diamond
Diamonds under UV light
Diamond grading certificate
Polished sphere of ocean jasper
Zincblende
Cut Peridot gemstone
Peridot gemstone
Oval cut emerald
Malachite, SEM
Mylonite, light micrograph
Chrysocolla
Chalcopyrite and quartz crystals
Magnetite in quartz
Cuprocassiterite in quartz mica schist
Garnet, variety Androdite
Cut and polished jasper
Ammolite gemstone
Quartz in sphalerite
Citrine gemstones and crystal
Citrine gemstones
Cut pink-violet Kunzite gemstone
Cut Zircon gemstone
Calcite on sphalerite
Hemimorphite
Oval amethyst
Trillion cut tourmaline gemstone
Cut Aquamarine gemstone
Cut green Paraiba Tourmaline gemstone
Cut and polished diamonds
Bismuth, close-up
Cut Kyanite gemstone
Cut Pyrope gemstone
Cut Rose Quartz gemstone
Cut Quartz gemstone
Cut yellow sapphire gemstone
Trillion cut diamond
Turquoise mineral
Oval cut amethyst
Oval cut Citrine
Oval cut citrine
Oval cut iolite
Oval cut peridot
Emerald, SEM
Raw turquoise
Tourmaline schorl specimen
Cut Scapolite round gemstone
Rhodochrosite and pyrite
Tiger's Eye
Polished vivid blue chrysocolla pebble
Aventurine gemstone
A lump of translucent agate
Seymchan pallasite
Lapis lazuli specimen
Garnet
Five polished ruby gemstones
Quartz polished stone
Jasp agate polished surface
Jasper polished stone
Polished and cut turquoise
Cut and polished agate
Polished variscite stone
Hedyphane
Sphalerite and pyrite
Rough opal
Gemstones, composite image
Asscher cut diamond gemstone
Pink diamonds
Jasper
Tiger eye
Quartz monzonite
Quartz boulder
Brecciated quartz
Herkimer diamonds
Jasper breccia rock
Types of diamonds, 19th century
Emerald crystal, Colombia
Near metallic lustre of anthracite rock
Round cut emerald
Radiant cut emerald
Trillion cut emerald