Peridot is the gem variety of olivine. Derived from the mantle and rarely from meteorites.
Iolite is the gem variety of the mineral cordierite. An alternative to sapphire and tanzanite.
Colored Stones Photos of beautiful colored stones from around the world.
Petrified Wood is a fossilized wood that often serves as a colorful gem material.
|Ruby and Sapphire
Ruby & Sapphire are gem corundums - ruby when red, sapphire when other colors.
Pictures of Opal A collection of different types of opal from all around the world and Mars too!
United States Gemstones Small mines in the U.S. produce a diversity of gemstones.
Rhodochrosite : a manganese mineral used as an ore, a pink gem and an ornamental stone.
|Gems from Space
Extraterrestrial Gems A number of materials from space have been used as attractive gems.
Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
Garnet is best known as a red gemstone. It occurs in any color and has many industrial uses.
Rhodonite is a pink manganese silicate used as a gemstone, an ornamental stone and an ore.
||All About Diamonds
Diamond a collection of photos, articles, facts, maps and graphs about diamonds.
Zoisite is a diverse gem. Tanzanite, thulite and anyolite are three of its gem varieties.
Star Garnets are found in only a few locations worldwide. They are the state gems of Idaho.
Turquoise A blue to bluish- green gem material that has been used for over 6000 years.
Fee Mining sites are mines that you can enter, pay a fee, and keep anything that you find.
Topaz is a popular birthstone and the #8 mineral in the Mohs Hardness Scale.
||Ant Hill Garnets
Ant Hill Garnets are tiny garnets that ants haul to the surface and discard on their anthill. Honest!
Peanut Wood? Yes! It is a very interesting gem material found in Western Australia.
Labradorite is a feldspar gem that can produce bright flashes of iridescent color.
||Amazing Agate Photos
Beautiful Agates A gallery of spectacular agate photos and descriptions by Richard Weston.
Organic Gems are gems formed from or by plants or animals. They might also be fossils.
Ammolite is a fossil and a gemstone. It is shell material from fossil ammonites.
||US Diamond Mines
US Diamond Mines Where are diamonds mined in the United States?
Rock Tumblers are machines that slowly turn rough rock into beautiful gemstones.
Turritella Agate is a brown agate containing snail fossils from the Green River Formation.
Spinel The gemstone that was confused with ruby and sapphire for over 1000 years.
Diamonds Do Not Form From Coal Learn several reasons why the coal origin is false.
||What Is Jade?
Jade has been used as a gemstone and a tool-making material for for 1000s of years.
Chrysoberyl an extreme gem. Its hardness is 8.5, can display chatoyance or color-change.
|Facts About Diamonds
Facts About Diamonds You are a diamond expert if you know all of these!
Sunstone A feldspar with aventurescence caused by tiny copper inclusions.
Gemstones of the World : A book by Robert Schumann. Over one million copies sold.
Ametrine is a bicolor quartz (amethyst + citrine) and a gemstone of growing popularity.
Cabochons A photo gallery of cabochon gemstones from around the world.
Kyanite is a metamorphic mineral that sometimes has a gemmy transparent blue color.
||US Gem Production
U.S. Gemstone Production is very low compared to the U.S. being the largest consumer.
You Can Be A Diamond Miner! At the Crater of Diamonds mine you can keep what you find.
Malachite has served as a gem material, pigment and ore of copper for thousands of years.
Spodumene is an ore of lithium and the mineral of the gems kunzite and hiddenite.
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.
Blood Diamonds Illegally-traded diamonds that may have been stolen or used to fund conflict.
Scapolite can be a pretty faceted stone or a translucent cab with cats eye and iris effects.
Diamonds are mined in many countries and their relative importance changes frequently.
Andalusite is a gem that exhibits strong pleochroism and often has sets of oriented inclusions.
Tectonic History In Jade Dates of metamorphism and fault motion are locked in jade.
Petrified Palm is often confused with petrified wood, but it is a distinctly different material.