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DIAMOND

Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic.

Diamond has the highest hardness and thermal conductivity of any natural material, properties that are utilized in major industrial applications such as cutting and polishing tools. They are also the reason that diamond anvil cells can subject materials to pressures found deep in the Earth.

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EMERALD

Emeralds are gem-quality specimens of the beryl mineral family with a rich, distinctly green color. 

For over 5000 years, emeralds have been one of the most desirable and valuable colored stones. Ancient civilizations in Africa, Asia, and South America independently discovered emeralds and made them a gemstone of highest esteem. 

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SAPPHIRE

The sapphire is the birthstone for the month of September. The name sapphire is derived from the Latin word ““saphirus” and the Greek word “sapheiros,” both meaning blue.

Some believe that the name sapphire is derived from its association with the planet Saturn. The name can be roughly be translated to mean “dear to the planet Saturn” in many different languages. Sapphires have been prized as great gemstones since 800BC. 

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RUBY

Color is the most significant factor affecting a ruby’s value: Fine gems are a pure, vibrant red to slightly purplish red.

Rubies can command the highest per-carat price of any colored stone. This makes ruby one of the most important gems in the colored stone market. In its purest form, the mineral corundum is colorless. Trace elements that become part of the mineral’s crystal structure cause variations in its color. 

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TANZANITE

Today, nearly all of the gems being sold as “tanzanite” have a blue color that has been produced or enhanced by heating.

The discovery of transparent crystals of blue zoisite in the 1960s stimulated interest in the gem. Soon after that discovery, laboratory experiments determined that heating could improve the color of some naturally blue stones. 

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