Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. It is the hardest naturally occurring substance known; it is also the most popular gemstone. The hardness, brilliance, and sparkle of diamonds make them unsurpassed as gems.

Diamonds were formed billions of years ago through a combination of tremendous pressure and temperatures of 1652-2372 degrees Fahrenheit at depths between 90 and 120 miles beneath Earth's surface. Diamond crystals are brought closer to the Earth's surface through volcanic activity.