Turquoise A blue to bluish- green gem material that has been used for over 6000 years.
Peridot is the gem variety of olivine. Derived from the mantle and rarely from meteorites.
Colored Stones Photos of beautiful colored stones from around the world.
Iolite is the gem variety of the mineral cordierite. An alternative to sapphire and tanzanite.
Pictures of Opal A collection of different types of opal from all around the world and Mars too!
||Ruby and Sapphire
Ruby & Sapphire are gem corundums - ruby when red, sapphire when other colors.
Petrified Wood is a fossilized wood that often serves as a colorful gem material.
United States Gemstones Small mines in the U.S. produce a diversity of gemstones.
|Gems from Space
Extraterrestrial Gems A number of materials from space have been used as attractive gems.
Rhodochrosite : a manganese mineral used as an ore, a pink gem and an ornamental stone.
Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
||All About Diamonds
Diamond a collection of photos, articles, facts, maps and graphs about diamonds.
Garnet is best known as a red gemstone. It occurs in any color and has many industrial uses.
Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
Zoisite is a diverse gem. Tanzanite, thulite and anyolite are three of its gem varieties.
Rhodonite is a pink manganese silicate used as a gemstone, an ornamental stone and an ore.
Star Garnets are found in only a few locations worldwide. They are the state gems of Idaho.
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!
Labradorite is a feldspar gem that can produce bright flashes of iridescent color.
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?
Peanut Wood? Yes! It is a very interesting gem material found in Western Australia.
|Amazing Agate Photos
Beautiful Agates A gallery of spectacular agate photos and descriptions by Richard Weston.
Rock Tumblers are machines that slowly turn rough rock into beautiful gemstones.
Organic Gems are gems formed from or by plants or animals. They might also be fossils.
||What Is Jade?
Jade has been used as a gemstone and a tool-making material for for 1000s of years.
Diamonds Do Not Form From Coal Learn several reasons why the coal origin is false.
Spinel The gemstone that was confused with ruby and sapphire for over 1000 years.
Turritella Agate is a brown agate containing snail fossils from the Green River Formation.
Gemstones of the World : A book by Robert Schumann. Over one million copies sold.
Sunstone A feldspar with aventurescence caused by tiny copper inclusions.
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!
Ametrine is a bicolor quartz (amethyst + citrine) and a gemstone of growing popularity.
|US Gem Production
U.S. Gemstone Production is very low compared to the U.S. being the largest consumer.
Iris Agate can produce a rainbow of colors when light passes between its thin bands.
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 and iris effects.
Blood Diamonds Illegally-traded diamonds that may have been stolen or used to fund conflict.
Cabochons A photo gallery of cabochon gemstones from around the world.
Kyanite is a metamorphic mineral that sometimes has a gemmy transparent blue color.
Malachite has served as a gem material, pigment and ore of copper for thousands of years.
You Can Be A Diamond Miner! At the Crater of Diamonds mine you can keep what you find.
Synthetic Diamonds of spectacular quality are now being produced in labs.
Tectonic History In Jade Dates of metamorphism and fault motion are locked in jade.
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.
Petrified Palm is often confused with petrified wood, but it is a distinctly different material.