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