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