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