100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
||Geology of Gems
Geology of Gems - The first comprehensive book on the geology of gem deposits.
Tumbled Stones are rocks that have been rounded, smoothed and polished in a rock tumbler.
Blue Gemstones - Most people shopping for a colored stone are looking for something blue.
|Gems from Space
Extraterrestrial Gems A number of materials from space are used as attractive gems.
Green Gemstones - emerald, peridot, jade, tsavorite, chrome diopside, chrysoprase, more.
Labradorite is a feldspar gem that can produce bright flashes of iridescent color.
||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!
||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.
Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
Gem Mineral Collections are a great way to learn about gem materials. Get yours.
Sunstone A feldspar with aventurescence caused by tiny copper inclusions.
Emerald is the most popular green gemstone in the United States and most of the world.
Ammolite is a fossil and a gemstone. It is shell material from fossil ammonites.
United States Gemstones Small mines in the U.S. produce a diversity of gemstones.
||Ant Hill Garnets
Ant Hill Garnets are tiny garnets that ants haul to the surface and discard on their anthill. Honest!
Gemstones of the World : A book by Robert Schumann. Over one million copies sold.
Organic Gems are gems formed from or by plants or animals. They might also be fossils.
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.
Topaz is a popular birthstone and the #8 mineral in the Mohs Hardness Scale.
Strontium Titanate - lab created diamond simulant with fire much stronger than diamond.
Rock Tumblers - All about rock tumblers and rock tumbling. Read before you buy a tumbler.
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.
Jet is a black organic gem material that forms from well-preserved woody material.
Spinel The gemstone that was confused with ruby and sapphire for over 1000 years.
||Ruby and Sapphire
Ruby & Sapphire are gem corundums - ruby when red, sapphire when other colors.
Garnet is best known as a red gemstone. It occurs in any color and has many industrial uses.
Ametrine is a bicolor quartz (amethyst + citrine) and a gemstone of growing popularity.
Blood Diamonds Illegally-traded diamonds that may have been stolen or used to fund conflict.
Lapis Lazuli - a metamorphic rock and the most popular blue opaque gemstone in history.
Malachite has served as a gem material, pigment and ore of copper for thousands of years.
Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
Fee Mining sites are mines that you can enter, pay a fee, and keep anything that you find.
Azurmalachite is a mixture of malachite and azurite. It can be a beautiful blue and green gem.
||US Diamond Mines
US Diamond Mines Where are diamonds mined in the United States?
Rose Quartz is the name used for specimens of translucent quartz with a pink color.
Petrified Wood is a fossilized wood that often serves as a colorful gem material.
Aventurine is translucent quartz with tiny reflective inclusions that produce aventurescence.
Kyanite is a metamorphic mineral that sometimes has a gemmy transparent blue color.
Beryl - the mineral of emerald, aquamarine, morganite, heliodor, goshenite, and more.
Bloodstone is a dark green jasper with a splatter of red color that looks like blood.
Cabochons A photo gallery of cabochon gemstones from around the world.
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.
Red Beryl is one of the rarest gems. Small amounts are mined at one locality in Utah.
You Can Be A Diamond Miner! At the Crater of Diamonds mine you can keep what you find.
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.
|Amazing Agate Photos
Beautiful Agates A gallery of spectacular agate photos and descriptions by Richard Weston.
Chatoyant Gems look like the eye of a cat. They have a line of light that moves across the gem.
Spodumene is an ore of lithium and the mineral of the gems kunzite and hiddenite.
Fancy Sapphires are gem corundums of any color other than red, blue or colorless.
Rhodonite is a pink manganese silicate used as a gemstone, an ornamental stone and an ore.
Apatite produces gemstones with vivid colors and is popular with collectors.
Smoky Quartz - A brown color-variety of the mineral quartz often cut as a gem.
Iolite is the gem variety of the mineral cordierite. An alternative to sapphire and tanzanite.
Iris Agate can produce a rainbow of colors when light passes between its thin bands.
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.
Benitoite - Geology of the State Gem of California - USGS report from 1911.
Serpentine - a group of metamorphic minerals used as gems and architectural stone.
Heliodor is a yellow, greenish-yellow or golden yellow beryl used as a gem.
||Facts About Diamonds
Facts About Diamonds You are a diamond expert if you know all of these!
Chrome Diopside is a green gemstone that is often used as an alternative stone for emerald.
Unakite A gem material composed of green epidote and pink orthoclase.
Azurite is a vivid blue copper mineral that can be cut into beautiful cabochon gems.
||Titanite aka Sphene
Titanite - also known as sphene, this mineral is a minor source of titanium and a minor gem.
Turritella Agate is a brown agate containing snail fossils from the Green River Formation.
Prasiolite is amethyst that has been heat-treated to a leek-green color.
Andalusite is a gem that exhibits strong pleochroism and often has sets of oriented inclusions.
Canadian Diamond Mines produce some of the largest and highest quality diamonds!
Helenite is a man-made glass produced by fusing ash from the 1980 Mount St. Helens eruption.
K2 Granite is a white granite with blue orbs of azurite. It is a new gem material from Pakistan.
||Maw Sit Sit
Maw Sit Sit is a metamorphic rock and a gem material that was once thought be jade.
||US Gem Production
U.S. Gemstone Production is very low compared to the U.S. being the largest consumer.
Diamonds are mined in many countries and their relative importance changes frequently.
Hardness Picks - Mohs hardness testing with precise and easy-to-use hardness picks.
Peanut Wood? Yes! It is a very interesting gem material found in Western Australia.
Synthetic Diamonds of spectacular quality are now being produced in labs.
||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.