Amethyst is a purple variety of one of the most common minerals in the earth-quartz. Other well-known varieties are citrine, tiger's eye and rose quartz.
Aquamarine is one of the most famous members of the beryl gem species, along with emerald. Other notable varieties are pink morganite and golden beryl.
Garnet is a group of related gem species that is best known for its red varieties. People don't realize, however, that garnet forms in many colors of the rainbow.
Peridot is a magnesium, iron silicate from the olivine family. It occurs in a narrow range of colors from yellowish or brownish green to greenish yellow.
Tourmaline is a group of related gem species with an extremely variable composition. The variable elements affect color, creating potentially every spectral shade.
Sapphire is a variety of the gem species, corundum. Corundum is aluminum oxide which, when pure, is colorless. If tiny amounts of elements like chromium or iron are...
Tanzanite is a newcomer to the gem world. It's a calcium, aluminum silicate that was discovered in 1967. It was found by chance when a Masai tribesman came upon the...
Topaz is an aluminum fluorosilicate that's found in many colors including yellow, orange, brown, pink, red, blue, light green and even colorless.
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