100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
Pictures of Opal A collection of different types of opal from all around the world and Mars too!
||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.
Gemstones of the World : A book by Robert Schumann. Over one million copies sold.
Emerald is the most popular green gemstone in the United States and most of the world.
Amethyst - the most popular purple gem. It has a beautiful color and reasonable price.
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.
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.
Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
Ammolite is a fossil and a gemstone. It is shell material from fossil ammonites.
Green Gemstones - emerald, peridot, jade, tsavorite, chrome diopside, chrysoprase, more.
Prasiolite is amethyst that has been heat-treated to a leek-green color.
Peridot is the gem variety of olivine. Derived from the mantle and rarely from meteorites.
|Ruby and Sapphire
Ruby & Sapphire are gem corundums - ruby when red, sapphire when other colors.
||Ant Hill Garnets
Ant Hill Garnets - tiny gems that ants haul to the surface and discard on their anthill. Honest!
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.
United States Gemstones Small mines in the U.S. produce a diversity of gemstones.
Strontium Titanate - lab created diamond simulant with fire much stronger than diamond.
||What Is Jade?
Jade has been used as a gemstone and a tool-making material for for 1000s of years.
Zircon is a popular and colorful gem with fire and brightness that rivals diamond.
Lapis Lazuli - a metamorphic rock and the most popular blue opaque gemstone in history.
Garnet is best known as a red gemstone. It occurs in any color and has many industrial uses.
Tourmaline - the most colorful mineral and natural gem material on Earth.
||Geology of Gems
Geology of Gems - The first comprehensive book on the geology of gem deposits.
Sunstone A feldspar with aventurescence caused by tiny copper inclusions.
||Gems from Space
Extraterrestrial Gems A number of materials from space are used as attractive gems.
Rose Quartz is the name used for specimens of translucent quartz with a pink color.
Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
Spinel The gemstone that was confused with ruby and sapphire for over 1000 years.
Star Garnets are found in only a few locations worldwide. They are the state gems of Idaho.
Malachite has served as a gem material, pigment and ore of copper for thousands of years.
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.
Ametrine is a bicolor quartz (amethyst + citrine) and a gemstone of growing popularity.
Organic Gems are gems formed from plant or animal materials.
Aventurine - a translucent quartz with reflective inclusions that cause aventurescence.
||US Diamond Mines
US Diamond Mines Where are diamonds mined in the United States?
Azurmalachite is a mixture of malachite and azurite. It can be a beautiful blue and green gem.
Red Beryl is one of the rarest gems. Small amounts are mined at one locality in Utah.
Kyanite is a metamorphic mineral used to make porcelain, abrasive products and gems.
Iris Agate can produce a rainbow of colors when light passes between its thin bands.
Rhodochrosite : a manganese mineral used as an ore, a pink gem and an ornamental stone.
Iolite is the gem variety of the mineral cordierite. An alternative to sapphire and tanzanite.
You Can Be A Diamond Miner! At the Crater of Diamonds mine you can keep what you find.
Beryl - the mineral of emerald, aquamarine, morganite, heliodor, goshenite, and more.
Benitoite - Geology of the State Gem of California - USGS report from 1911.
||Amazing Agate Photos
Beautiful Agates A gallery of spectacular agate photos and descriptions by Richard Weston.
Chrysoprase - The translucent green variety of chalcedony that is colored by nickel.
Cabochons A photo gallery of cabochon gemstones from around the world.
Petrified Wood is a fossilized wood that often serves as a colorful gem material.
Chrome Diopside is a green gemstone that is often used as an alternative stone for emerald.
Gem Mineral Collections are a great way to learn about gem materials. Get yours.
Diamonds Do Not Form From Coal Learn several reasons why the coal origin is false.
Rhodonite is a pink manganese silicate used as a gemstone, an ornamental stone and an ore.
Zoisite is a diverse gem. Tanzanite, thulite and anyolite are three of its gem varieties.
Azurite is a vivid blue copper mineral that can be cut into beautiful cabochon gems.
Spodumene is an ore of lithium and the mineral of the gems kunzite and hiddenite.
Rock Tumblers - All about rock tumblers and rock tumbling. Read before you buy a tumbler.
Apatite produces gemstones with vivid colors and is popular with collectors.
Chrysoberyl an extreme gem. Its hardness is 8.5, can display chatoyance or color-change.
Helenite is a man-made glass produced by fusing ash from the 1980 Mount St. Helens eruption.
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.
Chatoyant Gems look like the eye of a cat. They have a line of light that moves across the gem.
Scapolite can be a pretty faceted stone or a translucent cab with cats-eye effects.
Smoky Quartz - A brown color-variety of the mineral quartz often cut as a gem.
||US Gem Production
U.S. Gemstone Production is very low compared to the U.S. being the largest consumer.
|Titanite aka Sphene
Titanite is also known as sphene. It is a minor source of titanium and a minor gem.
Brown Diamonds are growing in popularity and are frequently seen in fashion jewelry.
||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.
Unakite A gem material composed of green epidote and pink orthoclase.
||Facts About Diamonds
Facts About Diamonds You are a diamond expert if you know all of these!
Synthetic Diamonds of spectacular quality are now being produced in labs.
Turritella Agate is a brown agate containing snail fossils from the Green River Formation.
|Polka Dot Agate
Polka Dot Agate - a translucent blue to white agate with a suspension of colorful dots.
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.
K2 Granite is a white granite with blue orbs of azurite. It is a new gem material from Pakistan.
Ethiopian Opal - The new opal heavyweight that might give Australia a run.
Geodes look like ordinary rocks on the outside but can be spectacular inside!
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!
Peanut Wood? Yes! It is a very interesting gem material found in Western Australia.
Geology Tools - Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.
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.