|Gems from Space
Extraterrestrial Gems A number of materials from space are used as attractive gems.
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
||Ruby and Sapphire
Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States.
Pictures of Opal A collection of different types of opal from all around the world and Mars too!
Blue Gemstones - Most people shopping for a colored stone are looking for something blue.
Labradorite is a feldspar gem that can produce bright flashes of iridescent color.
Green Gemstones - emerald, peridot, jade, tsavorite, chrome diopside, chrysoprase, more.
||All About Diamonds
Diamond A collection of photos, articles, facts, maps and graphs about diamonds.
Turquoise A blue to bluish- green gem material that has been used for over 6000 years.
United States Gemstones Small mines in the U.S. produce a diversity of gemstones.
Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
Tumbled Stones are rocks that have been rounded, smoothed and polished in a rock tumbler.
Kyanite is a metamorphic mineral used to make porcelain, abrasive products and gems.
Ammolite is a fossil and a gemstone. It is shell material from fossil ammonites.
Gem Mineral Collections are a great way to learn about gem materials. Get yours.
Emerald is the most popular green gemstone in the United States and most of the world.
Gemstones of the World : A book by Robert Schumann. Over one million copies sold.
Topaz is a popular birthstone and the #8 mineral in the Mohs Hardness Scale.
Sunstone A feldspar with aventurescence caused by tiny copper inclusions.
Organic Gems are gems formed from or by plants or animals. They might also be fossils.
|Ruby and Sapphire
Ruby & Sapphire are gem corundums - ruby when red, sapphire when other colors.
Fee Mining sites are mines that you can enter, pay a fee, and keep anything that you find.
Spinel The gemstone that was confused with ruby and sapphire for over 1000 years.
Strontium Titanate - lab created diamond simulant with fire much stronger than diamond.
Semiprecious vs. Precious - What is the difference between these two types of stones?
||Ant Hill Garnets
Ant Hill Garnets are tiny garnets that ants haul to the surface and discard on their anthill. Honest!
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.
Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
Star Garnets are found in only a few locations worldwide. They are the state gems of Idaho.
Bloodstone is a dark green jasper with a splatter of red color that looks like blood.
Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
Peridot is the gem variety of olivine. Derived from the mantle and rarely from meteorites.
||Geology of Gems
Geology of Gems - The first comprehensive book on the geology of gem deposits.
Blood Diamonds Illegally-traded diamonds that may have been stolen or used to fund conflict.
||What Is Jade?
Jade has been used as a gemstone and a tool-making material for for 1000s of years.
Beryl - the mineral of emerald, aquamarine, morganite, heliodor, goshenite, and more.
Azurmalachite is a mixture of malachite and azurite. It can be a beautiful blue and green gem.
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.
|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.
Petrified Wood is a fossilized wood that often serves as a colorful gem material.
Malachite has served as a gem material, pigment and ore of copper for thousands of years.
Rhodochrosite : a manganese mineral used as an ore, a pink gem and an ornamental stone.
Red Beryl is one of the rarest gems. Small amounts are mined at one locality in Utah.
Diamonds Do Not Form From Coal Learn several reasons why the coal origin is false.
Benitoite - Geology of the State Gem of California - USGS report from 1911.
Aventurine is translucent quartz with tiny reflective inclusions that produce aventurescence.
Cabochons A photo gallery of cabochon gemstones from around the world.
Apatite produces gemstones with vivid colors and is popular with collectors.
Chrysoprase - The translucent green variety of chalcedony that is colored by nickel.
Scapolite can be a pretty faceted stone or a translucent cab with cats eye and iris effects.
Rhodonite is a pink manganese silicate used as a gemstone, an ornamental stone and an ore.
Iris Agate can produce a rainbow of colors when light passes between its thin bands.
Fancy Sapphires are gem corundums of any color other than red, blue or colorless.
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.
Smoky Quartz - A brown color-variety of the mineral quartz often cut as a gem.
||Facts About Diamonds
Facts About Diamonds You are a diamond expert if you know all of these!
Chatoyant Gems look like the eye of a cat. They have a line of light that moves across the gem.
Rose Quartz is the name used for specimens of translucent quartz with a pink color.
||Maw Sit Sit
Maw Sit Sit is a metamorphic rock and a gem material that was once thought be jade.
Zoisite is a diverse gem. Tanzanite, thulite and anyolite are three of its gem varieties.
Chrysoberyl an extreme gem. Its hardness is 8.5, can display chatoyance or color-change.
You Can Be A Diamond Miner! At the Crater of Diamonds mine you can keep what you find.
||US Gem Production
U.S. Gemstone Production is very low compared to the U.S. being the largest consumer.
Azurite is a vivid blue copper mineral that can be cut into beautiful cabochon gems.
Unakite A gem material composed of green epidote and pink orthoclase.
Andalusite is a gem that exhibits strong pleochroism and often has sets of oriented inclusions.
Serpentine - a group of metamorphic minerals used as gems and architectural stone.
Chrome Diopside is a green gemstone that is often used as an alternative stone for emerald.
|Polka Dot Agate
Polka Dot Agate is a translucent blue to white agate with a suspension of colorful dots.
Petrified Palm is often confused with petrified wood, but it is a distinctly different material.
Heliodor is a yellow, greenish-yellow or golden yellow beryl used as a gem.
Iolite is the gem variety of the mineral cordierite. An alternative to sapphire and tanzanite.
Prasiolite is amethyst that has been heat-treated to a leek-green color.
Helenite is a man-made glass produced by fusing ash from the 1980 Mount St. Helens eruption.
Diamonds are mined in many countries and their relative importance changes frequently.
||Titanite aka Sphene
Titanite - also known as sphene, this mineral is a minor source of titanium and a minor gem.
Peanut Wood? Yes! It is a very interesting gem material found in Western Australia.
Hardness Picks - Mohs hardness testing with precise and easy-to-use hardness picks.
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.
K2 Granite is a white granite with blue orbs of azurite. It is a new gem material from Pakistan.
Canadian Diamond Mines produce some of the largest and highest quality diamonds!