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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Baguette-Cut Purple & Golden Ametrine Gemstone, Bolivia - Roadshow Collectibles

Baguette-Cut Purple & Golden Ametrine Gemstone, Bolivia.

Emerald-Cut Purple & White Ametrine Gemstone, Bolivia - Roadshow Collectibles

Emerald-Cut Purple & White Ametrine Gemstone, Bolivia.

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

Emerald-Cut Amethyst Gemstone, Deep Purple, Brazil.

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

Emerald-Cut Amethyst Gemstone, Deep Purple, Brazil.

Blue Aquamarine Emerald Cut Gemstone, Africa - Roadshow Collectibles

Blue Aquamarine Emerald Cut Gemstone, Africa.

Freeform Pink Topaz Gemstone, Brazil - Roadshow Collectibles

Freeform Pink Topaz Gemstone, Brazil.

Free Form Cut Prasiolite Green Quartz Gemstone, Brazil - Roadshow Collectibles

Free Form Cut Prasiolite Green Quartz Gemstone, Brazil.

Ceylon Cut Purple & Golden Ametrine Gemstone, Bolivia - Roadshow Collectibles

Ceylon Cut Purple & Golden Ametrine Gemstone, Bolivia.

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

Oval-Cut Violet Purple Amethyst Gemstone, Brazil.

Ceylon Cut Blue Topaz Gemstone, Brazil - Roadshow Collectibles

Ceylon Cut Blue Topaz Gemstone, Brazil.

Asscher Cut Golden Orange Citrine Gemstone, Brazil - Roadshow Collectibles

Asscher Cut Golden Orange Citrine Gemstone, Brazil.

Oval-Cut Hessonite Garnet, Orange, Cinnamon, Africa - Roadshow Collectibles

Oval-Cut Hessonite Garnet, Orange, Cinnamon, Africa.

Round Cut Violet Purple Amethyst Gemstone, Brazil - Roadshow Collectibles

Round Cut Violet Purple Amethyst Gemstone, Brazil.

Ceylon Cut Golden Orange Citrine Gemstone, Brazil - Roadshow Collectibles

Ceylon Cut Golden Orange Citrine Gemstone, Brazil.

Oval-Cut Green Amethyst Gemstone, Uruguay - Roadshow Collectibles

Oval-Cut Green Amethyst Gemstone, Uruguay.

Emerald-Cut Purple Amethyst Gemstone, Brazil - Roadshow Collectibles

Emerald-Cut Purple Amethyst Gemstone, Brazil.

Oval-Cut Green Amethyst Gemstone, Uruguay - Roadshow Collectibles

Oval-Cut Green Amethyst Gemstone, Uruguay.

Cabochon Oval Red Ruby Gemstone, Madagascar - Roadshow Collectibles

Cabochon Oval Red Ruby Gemstone, Madagascar.

Oval-Cut Purple Amethyst Gemstone, Brazil - Roadshow Collectibles

Oval-Cut Purple Amethyst Gemstone, Brazil.

Oval-Cut Pink Topaz Gemstone, Brazil - Roadshow Collectibles

Oval-Cut Pink Topaz Gemstone, Brazil.

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