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Gemstones


Ruby and Sapphire
Ruby and Sapphire
Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States.
Geology.com Store
Geology gifts
Gifts that Rock! Find something for the rockhound on your holiday shopping list.
100+ Gems
gem photos
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
All About Diamonds
Diamond
Diamond A collection of photos, articles, facts, maps and graphs about diamonds.
Amethyst
Amethyst
Amethyst - the most popular purple gem. It has a beautiful color and reasonable price.
Topaz
Topaz
Topaz is a popular birthstone and the #8 mineral in the Mohs Hardness Scale.
Opal Photos
Opal
Pictures of Opal A collection of different types of opal from all around the world and Mars too!
Emerald
emerald
Emerald is the most popular green gemstone in the United States and most of the world.
Don*t Go To Jail
Don't Go To Jail
Mineral collectors must know the rules for removing specimens from public and private property.
Green Gemstones
Green Gemstones
Green Gemstones - emerald, peridot, jade, tsavorite, chrome diopside, chrysoprase, more.
Gems from Space
Gems from Space
Extraterrestrial Gems A number of materials from space are used as attractive gems.
Turquoise
Turquoise
Turquoise A blue to bluish- green gem material that has been used for over 6000 years.
U.S. Gemstones
U.S. Gemstones
United States Gemstones Small mines in the U.S. produce a diversity of gemstones.
Tanzanite
tanzanite
Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
Tumbled Stones
Tumbled Stones
Tumbled Stones are rocks that have been rounded, smoothed and polished in a rock tumbler.
Garnet
Garnet
Garnet is best known as a red gemstone. It occurs in any color and has many industrial uses.
Blood Diamonds
Blood Diamonds
Blood Diamonds Illegally-traded diamonds that may have been stolen or used to fund conflict.
Strontium Titanate
strontium titanate
Strontium Titanate - lab created diamond simulant with fire much stronger than diamond.
Blue Gemstones
blue gemstones
Blue Gemstones - Most people shopping for a colored stone are looking for something blue.
Ethiopian Opal
Ethiopian opal
Ethiopian Opal - The new opal heavyweight that might give Australia a run.
Labradorite
Labradorite
Labradorite is a feldspar gem that can produce bright flashes of iridescent color.
Geodes
Geodes
Geodes look like ordinary rocks on the outside but can be spectacular inside!
Sunstone
Sunstone
Sunstone A feldspar with aventurescence caused by tiny copper inclusions.
Peridot
Peridot
Peridot is the gem variety of olivine. Derived from the mantle and rarely from meteorites.
Organic Gems
Organic Gems
Organic Gems are gems formed from plant or animal materials.
Gem Minerals
Gem Mineral Collections
Gem Mineral Collections are a great way to learn about gem materials. Get yours.
Ant Hill Garnets
Ant Hill Garnets
Ant Hill Garnets - tiny gems that ants haul to the surface and discard on their anthill. Honest!
Ammolite
Ammolite
Ammolite is a fossil and a gemstone. It is shell material from fossil ammonites.
Lapis Lazuli
lapis lazuli
Lapis Lazuli - a metamorphic rock and the most popular blue opaque gemstone in history.
Tourmaline
Tourmaline
Tourmaline - the most colorful mineral and natural gem material on Earth.
Zircon
Zircon
Zircon is a popular and colorful gem with fire and brightness that rivals diamond.
Rose Quartz
Rose Quartz
Rose Quartz is the name used for specimens of translucent quartz with a pink color.
Ruby and Sapphire
Ruby and Sapphire
Ruby & Sapphire are gem corundums - ruby when red, sapphire when other colors.
Fire Opal
Fire Opal
Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
Gem Beryl
Gem Beryl
Beryl - the mineral of emerald, aquamarine, morganite, heliodor, goshenite, and more.
Gemstone Book
Gemstones of the World
Gemstones of the World : A book by Robert Schumann. Over one million copies sold.
US Diamond Mines
United States Diamond Mines
US Diamond Mines Where are diamonds mined in the United States?
Spodumene
Spodumene
Spodumene is an ore of lithium and the mineral of the gems kunzite and hiddenite.
What Is Jade?
Jade
Jade has been used as a gemstone and a tool-making material for for 1000s of years.
Star Garnet
Star Garnet
Star Garnets are found in only a few locations worldwide. They are the state gems of Idaho.
Amazing Agate Photos
Agates
Beautiful Agates A gallery of spectacular agate photos and descriptions by Richard Weston.
Jet
jet
Jet is a black organic gem material that forms from well-preserved woody material.
Petrified Wood
Petrified Wood
Petrified Wood is a fossilized wood that often serves as a colorful gem material.
Arkansas Diamonds
Arkansas Diamonds
You Can Be A Diamond Miner! At the Crater of Diamonds mine you can keep what you find.
Red Beryl
Red Beryl
Red Beryl is one of the rarest gems. Small amounts are mined at one locality in Utah.
Gem Silica
Gem Silica
Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
Spinel
Spinel
Spinel The gemstone that was confused with ruby and sapphire for over 1000 years.
Cabochons
Cabochons
Cabochons A photo gallery of cabochon gemstones from around the world.
Malachite
Malachite
Malachite has served as a gem material, pigment and ore of copper for thousands of years.
Ametrine
Ametrine
Ametrine is a bicolor quartz (amethyst + citrine) and a gemstone of growing popularity.
Biggest Misconception
Diamonds from Coal
Diamonds Do Not Form From Coal Learn several reasons why the coal origin is false.
Facts About Diamonds
Diamond Facts
Facts About Diamonds You are a diamond expert if you know all of these!
Bloodstone
bloodstone
Bloodstone is a dark green jasper with a splatter of red color that looks like blood.
Fancy Sapphire
Fancy Sapphires
Fancy Sapphires are gem corundums of any color other than red, blue or colorless.
Tiffany Stone
Tiffany Stone
Tiffany Stone is a rare purple, blue and white rock, mined in Utah, and used as a gem.
Zoisite
zoisite
Zoisite is a diverse gem. Tanzanite, thulite and anyolite are three of its gem varieties.
US Gem Production
US Gemstone Production
U.S. Gemstone Production is very low compared to the U.S. being the largest consumer.
Rhodochrosite
Rhodochrosite
Rhodochrosite : a manganese mineral used as an ore, a pink gem and an ornamental stone.
Geology of Gems
Geology of Gems
Geology of Gems - The first comprehensive book on the geology of gem deposits.
Kyanite
kyanite
Kyanite is a metamorphic mineral used to make porcelain, abrasive products and gems.
Apatite
Apatite
Apatite produces gemstones with vivid colors and is popular with collectors.
Rock Tumbling
rock tumblers
Rock Tumblers - All about rock tumblers and rock tumbling. Read before you buy a tumbler.
Smoky Quartz
Smoky quartz
Smoky Quartz - A brown color-variety of the mineral quartz often cut as a gem.
Iolite
Iolite
Iolite is the gem variety of the mineral cordierite. An alternative to sapphire and tanzanite.
Aventurine
Aventurine
Aventurine - a translucent quartz with reflective inclusions that cause aventurescence.
Brown Diamonds
Brown Diamonds
Brown Diamonds are growing in popularity and are frequently seen in fashion jewelry.
Azurite
Azurite
Azurite is a vivid blue copper mineral that can be cut into beautiful cabochon gems.
Synthetic Diamonds
Synthetic Diamonds
Synthetic Diamonds of spectacular quality are now being produced in labs.
Titanite aka Sphene
Titanite
Titanite is also known as sphene. It is a minor source of titanium and a minor gem.
Diopside
Chrome Diopside
Chrome Diopside is a green gemstone that is often used as an alternative stone for emerald.
Chatoyant Gems
cats eye gems
Chatoyant Gems look like the eye of a cat. They have a line of light that moves across the gem.
Benitoite
Benitoite
Benitoite - Geology of the State Gem of California - USGS report from 1911.
Moldavite
moldavite
Moldavite is a gem material born about 15 million years ago when a pair of asteroids struck Europe.
Rhodonite
rhodonite
Rhodonite is a pink manganese silicate used as a gemstone, an ornamental stone and an ore.
Diamond Producers
Diamond Producers
Diamonds are mined in many countries and their relative importance changes frequently.
Polka Dot Agate
Polka Dot Agate
Polka Dot Agate - a translucent blue to white agate with a suspension of colorful dots.
Scapolite
Scapolite
Scapolite can be a pretty faceted stone or a translucent cab with cats-eye effects.
Peanut Wood?
Peanut Wood
Peanut Wood? Yes! It is a very interesting gem material found in Western Australia.
Heliodor
Heliodor
Heliodor is a yellow, greenish-yellow or golden yellow beryl used as a gem.
Chrysoprase
Chrysoprase
Chrysoprase - The translucent green variety of chalcedony that is colored by nickel.
Tumbled Stones
Tumbled Gemstones
50+ Different Tumbled Stones for sale at RockTumbler.com. (affiliated with geology.com)
Helenite
Helenite
Helenite is a man-made glass produced by fusing ash from the 1980 Mount St. Helens eruption.
Andalusite
Andalusite
Andalusite - exhibits strong pleochroism and often has sets of oriented inclusions.
Chrysoberyl
chrysoberyl
Chrysoberyl an extreme gem. Its hardness is 8.5, can display chatoyance or color-change.
Iris Agate
Iris Agate
Iris Agate can produce a rainbow of colors when light passes between its thin bands.
Unakite
Unakite
Unakite A gem material composed of green epidote and pink orthoclase.
Azurmalachite
azurmalachite
Azurmalachite is a mixture of malachite and azurite. It can be a beautiful blue and green gem.
Serpentine
Serpentine
Serpentine - a group of metamorphic minerals used as gems and architectural stone.
Canadian Diamonds
Canadian Diamonds
Canadian Diamond Mines produce some of the largest and highest quality diamonds!
Hardness Picks
Hardness Picks
Hardness Picks - Mohs hardness testing with precise and easy-to-use hardness picks.
Turritella Agate
Turritella Agate
Turritella Agate is a brown agate containing snail fossils from the Green River Formation.
Geology Tools
Geology Tools
Geology Tools - Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.
Petrified Palm
Petrified Palm
Petrified Palm is often confused with petrified wood. It is a distinctly different material.
Maw Sit Sit
Maw Sit Sit
Maw Sit Sit is a metamorphic rock and a gem material that was once thought be jade.
Prasiolite
Prasiolite
Prasiolite is amethyst that has been heat-treated to a leek-green color.
K2 Granite
K2 Granite - aka K2 Jasper
K2 Granite is a white granite with blue orbs of azurite. It is a new gem material from Pakistan.
Semiprecious
Semiprecious vs. Precious
Semiprecious vs. Precious - What is the difference between these two types of stones?
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Wyoming Gemstones
Fee Mining
Fee Mining
Fee Mining sites are mines that you can enter, pay a fee, and keep anything that you find.
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Coloured Gemstone Deposits in the Yukon