Diamond’s splendor has been appreciated for centuries, but there was not much scientific knowledge about it before the twentieth century. Since then, diamond knowledge has grown steadily, with …

Diamond forms under high temperature and pressure conditions that exist only within a specific depth range (about 100 miles) beneath the earth’s surface. Diamond’s crystal structure is isometric, which …

The 4Cs describe the individual qualities of a diamond, and the value of an individual diamond is based on these qualities. The terms that people use to discuss the 4Cs have become part of an …

Get to know all you need about diamond – the history, facts, quality factors, treatments, imitations and much more here at GIA.

钻石只在地球表面之下大约 100 英里的高温和高压条件下形成。 钻石的碳原子在所有方向上的键合都基本相同。 另一种矿物 - 石墨，同样也仅包含碳，但其形成过程和晶体结构却大不相同。 石墨十分柔 …

The origin of a natural diamond. Forming the hardest natural mineral on earth. Billions of years ago, 100 miles (161 km) or more in the mantle of the earth, pressure, heat and carbon atoms converged, …

A diamond’s journey is every bit as fascinating as its sparkle. GIA’s Diamond Origin and its related resources help you tell the story of the people in the country who brought you your diamond and …

Fancy Color Diamond Dazzling brilliance. Captivating color. These are the planet’s most valued gems.

Mar 14, 2013 · The prospect of purchasing a diamond may seem daunting, but through GIA, an unbiased authority on diamonds, you have several handy resources to help you select the highest …

Nov 24, 2015 · Diamond crystals are brought closer to the Earth’s surface through volcanic activity. Diamonds can be found in shallow alluvial deposits where the crystals settle after being transported …