Gemstones

Diamond A collection of photos, articles, facts, maps and graphs about diamonds.

Pictures of Opal A collection of different types of opal from all around the world and Mars too!

Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States.

Tumbled Stones are rocks that have been rounded, smoothed and polished in a rock tumbler.

Emerald is the most popular green gemstone in the United States and most of the world.

Extraterrestrial Gems A number of materials from space are used as attractive gems.

Mined in America - Small mines in the United States produce a diversity of beautiful gemstones.

Amethyst - the most popular purple gem. It has a beautiful color and reasonable price.

Green Gemstones - emerald, peridot, jade, tsavorite, chrome diopside, chrysoprase, more.

Moonstone is one of the world*s most popular gems. A soft glow of light floats under its surface.

Colored Diamonds are diamonds with a noticeable body color. They can sell for over $1M/carat.

Gemstones of the World : A book by Robert Schumann. Over one million copies sold.

Blue Gemstones - Most people shopping for a colored stone are looking for something blue.

Gem Mineral Collections are a great way to learn about gem materials. Get yours.

Labradorite is a feldspar gem that can produce bright flashes of iridescent color.

Strontium Titanate - lab created diamond simulant with fire much stronger than diamond.

Geodes look like ordinary rocks on the outside but can be spectacular inside!

Topaz is a popular birthstone and the #8 mineral in the Mohs Hardness Scale.

Blood Diamonds Illegally-traded diamonds that may have been stolen or used to fund conflict.

Goldstone is a colorful man-made glass that is full of highly-reflective metallic inclusions.

Jade has been used as a gemstone and a tool-making material for for 1000s of years.

Geology of Gems - The first comprehensive book on the geology of gem deposits.

Spinel The gemstone that was confused with ruby and sapphire for over 1000 years.

Garnet is best known as a red gemstone. It occurs in any color and has many industrial uses.

Ammolite is a fossil and a gemstone. It is shell material from fossil ammonites.

Ethiopian Opal - The new opal heavyweight that might give Australia a run.

Tourmaline - the most colorful mineral and natural gem material on Earth.

100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.

Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.

Ant Hill Garnets - tiny gems that ants haul to the surface and discard on their anthill. Honest!

Turquoise A blue to bluish- green gem material that has been used for over 6000 years.

Ruby & Sapphire are gem corundums - ruby when red, sapphire when other colors.

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.

Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.

Spodumene is an ore of lithium and the mineral of the gems kunzite and hiddenite.

Rose Quartz is the name used for specimens of translucent quartz with a pink color.

Organic Gems are gems formed from plant or animal materials.

Diamonds Do Not Form From Coal Learn several reasons why the coal origin is false.

Star Garnets are found in only a few locations worldwide. They are the state gems of Idaho.

Sunstone A feldspar with aventurescence caused by tiny copper inclusions.

Synthetic Opal is a man-made material with the play-of-color and appearance of natural opal.

Rock Tumblers - All about rock tumblers and rock tumbling. Read before you buy a tumbler.

Tiffany Stone is a rare purple, blue and white rock, mined in Utah, and used as a gem.

Lapis Lazuli - a metamorphic rock and the most popular blue opaque gemstone in history.

Azurmalachite is a mixture of malachite and azurite. It can be a beautiful blue and green gem.

Peridot is the gem variety of olivine. Derived from the mantle and rarely from meteorites.

Facts About Diamonds You are a diamond expert if you know all of these!

Green Diamonds - one of the rarest and most valuable diamond colors.

Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.

Zircon is a popular and colorful gem with fire and brightness that rivals diamond.

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.

Cabochons A photo gallery of cabochon gemstones from around the world.

Fire Agate is a rare brown agate that exhibits iridescent colors of red, orange, yellow and green.

Malachite has served as a gem material, pigment and ore of copper for thousands of years.

Lepidolite - a pink to purple mica sometimes used as a gem. A source of color in pink aventurine.

Rhodochrosite : a manganese mineral used as an ore, a pink gem and an ornamental stone.

Magnesite is a white mineral that is often dyed to imitate turquoise or dyed outrageous colors for fun.

Common Opal is a material that does not exhibit the play-of-color seen in precious opal.

Aventurine - a translucent quartz with reflective inclusions that cause aventurescence.

Rhodonite is a pink manganese silicate used as a gemstone, an ornamental stone and an ore.

Fancy Sapphires are gem corundums of any color other than red, blue or colorless.

Bloodstone is a dark green jasper with a splatter of red color that looks like blood.

Unakite A gem material composed of green epidote and pink orthoclase.

Looking Into the Mysteries of Gems and exploring their hidden secrets with a microscope.

Iris Agate can produce a rainbow of colors when light passes between its thin bands.

Andalusite - exhibits strong pleochroism and often has sets of oriented inclusions.

Ametrine is a bicolor quartz (amethyst + citrine) and a gemstone of growing popularity.

US Diamond Mines Where are diamonds mined in the United States?

Benitoite - Geology of the State Gem of California - USGS report from 1911.

Brown Diamonds are growing in popularity and are frequently seen in fashion jewelry.

U.S. Gemstone Production is very low compared to the U.S. being the largest consumer.

Kyanite is a metamorphic mineral used to make porcelain, abrasive products and gems.

Azurite is a vivid blue copper mineral that can be cut into beautiful cabochon gems.

Red Beryl is one of the rarest gems. Small amounts are mined at one locality in Utah.

Moldavite is a gem material born about 15 million years ago when a pair of asteroids struck Europe.

Maw Sit Sit is a metamorphic rock and a gem material that was once thought be jade.

Helenite is a man-made glass produced by fusing ash from the 1980 Mount St. Helens eruption.

Chatoyant Gems look like the eye of a cat. They have a line of light that moves across the gem.

Cat's-Eye Opal - a phenomenal opal that exhibits chatoyance when properly cut en cabochon.

Chrome Diopside is a green gemstone that is often used as an alternative stone for emerald.

Smoky Quartz - A brown color-variety of the mineral quartz often cut as a gem.

Diamonds are mined in many countries and their relative importance changes frequently.

Apatite produces gemstones with vivid colors and is popular with collectors.

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.

Iolite is the gem variety of the mineral cordierite. An alternative to sapphire and tanzanite.

Variscite is a yellowish green to bluish green mineral. It is similar to turquoise and cut as a gem.

Morado Opal is a purple variety of common opal which is found in central Mexico.

Green Amethyst and Yellow Emerald are misleading names according to the FTC.

Serpentine - a group of metamorphic minerals used as gems and architectural stone.

Chrysoprase - The translucent green variety of chalcedony that is colored by nickel.

Titanite is also known as sphene. It is a minor source of titanium and a minor gem.

Geology Tools - Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.

Scapolite can be a pretty faceted stone or a translucent cab with cats-eye effects.

K2 Granite is a white granite with blue orbs of azurite. It is a new gem material from Pakistan.

Petrified Palm is often confused with petrified wood. It is a distinctly different material.

Canadian Diamond Mines produce some of the largest and highest quality diamonds!

Hardness Picks - Mohs hardness testing with precise and easy-to-use hardness picks.

Yellow Diamonds are the most valuable yellow gems and the 2nd most common fancy diamond.

Gaspeite is a rare green ore of nickel that has become a popular gem in southwestern jewelry.

Polka Dot Agate - a translucent blue to white agate with a suspension of colorful dots.

Heliodor is a yellow, greenish-yellow or golden yellow beryl used as a gem.

Sonora Sunrise is a gem material of Mexico composed of red cuprite and blue-green chrysocolla.

Turritella Agate is a brown agate containing snail fossils from the Green River Formation.

Peanut Wood? Yes! It is a very interesting gem material found in Western Australia.

Prasiolite is amethyst that has been heat-treated to a leek-green color.