Gemstones/Crystals

Many minerals form beautiful crystals, but the most prized of all are gemstones. Uncut gems often look fairly ordinary like rocks. It's only when they are cut and polished that they obtain the brilliance and lustre that gives them their value.

Historically, gems have been divided into precious and semiprecious classes. There are a number of semiprecious gems, many quite beautiful, but diamonds, rubies, sapphires, and emeralds continue to qualify as "precious."

More than 4,000 naturally occurring minerals inorganic solids that have a characteristic chemical composition and specific crystal structure have been found on Earth. They are formed of simple molecules or individual elements arranged in repeating chains, sheets, or three-dimensional arrays.

Minerals are typically formed when molten rock, or magma, cools, or by separating out of the mineral-rich water, such as that in underground caverns. In general, mineral particles are small, having formed within confined areas such as lava flows or between grains of sediments. Large crystals found in geodes and other rocks are relatively rare.

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Oval-Cut Purple Amethyst Gemstone, Brazil - Roadshow Collectibles

Oval-Cut Purple Amethyst Gemstone, Brazil.

Emerald-Cut Aquamarine Gemstone, Deep Aqua Blue, Africa - Roadshow Collectibles

Emerald-Cut Aquamarine Gemstone, Deep Aqua Blue, Africa.

Emerald-Cut Purple Amethyst Gemstone, Brazil - Roadshow Collectibles

Emerald-Cut Purple Amethyst Gemstone, Brazil.

Round Cut Black Diamond Gemstone - Roadshow Collectibles

Round Cut Black Diamond Gemstone.

Emerald-Cut Aquamarine Gemstone, Africa - Roadshow Collectibles

Emerald-Cut Aquamarine Gemstone, Africa.

Princess-Cut Purple & Yellow Ametrine Gemstone, Bolivia - Roadshow Collectibles

Princess-Cut Purple & Yellow Ametrine Gemstone, Bolivia.

Emerald-Cut Purple Violet Amethyst Gemstone, Brazil - Roadshow Collectibles

Emerald-Cut Purple Violet Amethyst Gemstone, Brazil.

Round Cut Pink Botswana Agate Gemstones, Africa - Roadshow Collectibles

Round Cut Pink Botswana Agate Gemstones, Africa.

Briolette Cut Purple & Golden Ametrine Gemstones, Bolivia - Roadshow Collectibles

Briolette Cut Purple & Golden Ametrine Gemstones, Bolivia.

Pear-Cut Aquamarine Gemstones, Colour Greenness Blue, Brazil - Roadshow Collectibles

Pear-Cut Aquamarine Gemstones, Colour Greenness Blue, Brazil.

Pear-Cut Ruby Gemstone, Heavily Included Slightly Purplish Red, Africa - Roadshow Collectibles

Pear-Cut Ruby Gemstone, Heavily Included Slightly Purplish Red, Africa

Oval Faceted Cut Pink Sapphire Gemstone, Madagascar - Roadshow Collectibles

Oval Faceted Cut Pink Sapphire Gemstone, Madagascar.

Natural Oval Cut Tanzanite Gemstone, Bluish Violet, Tanzania, Africa - Roadshow Collectibles

Natural Oval Cut Tanzanite Gemstone, Bluish Violet, Tanzania, Africa.

Pear-Cut Ruby Gemstone, Translucent, Slightly Purplish Red, Africa - Roadshow Collectibles

Pear-Cut Ruby Gemstone, Translucent, Slightly Purplish Red, Africa.

Opal Boulder, Well Cut and Treated, Australia - Roadshow Collectibles

Opal Boulder, Well Cut and Treated, Australia.

Black Opal Gemstone, Natural Cut Free Form, with Fire Sparkles - Roadshow Collectibles

Black Opal Gemstone, Natural Cut Free Form, with Fire Sparkles.

Large Hefty Round Cabochon Labradorite Gemstone Translucent Madagascar - Roadshow Collectibles

Large Hefty Round Cabochon Labradorite Gemstone Translucent Madagascar

Large Hefty Round Cabochon Labradorite Gemstone, Canada - Roadshow Collectibles

Large Hefty Round Cabochon Labradorite Gemstone, Canada.

Turquoise Gemstone, Free Form Cut, Bluish Green, Persian - Roadshow Collectibles

Turquoise Gemstone, Free Form Cut, Bluish Green, Persian.

Hefty Oval Cabochon Labradorite Gemstone - Roadshow Collectibles

Hefty Labradorite Gemstone, Oval Cabochon, Translucent, Madagascar.

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