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 …

Diamond stands at the apex of the hardness scale with a value of 10. It also has the highest thermal conductivity and the highest molar density of any terrestrial material, as well as a high resistance to …

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

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

Jan 10, 2017 · Incredibly hard, highly refractive, practically impervious to heat, diamond is a crystal form of carbon. But what makes it a real diamond? Find out!

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, …

May 3, 2024 · Examines new developments in the story of diamond formation and their extraction from the earth.

GIA’s Guide to Gemstones: Gem Encyclopedia GIA’s Gem Encyclopedia is a virtual journey through the science and lore of gemstones from across the globe. Each precious stone page features additional …

As the home of gemological research and education, we invented many of the instruments used by the international gem and jewelry industry, and we even created the 4Cs of diamond quality.

This 1925 photo taken at the Green Vaults by Rosch and Krumbhaar shows crown and pavilion views of the Dresden Green, along with a 17-ct drilled briolette-cut colorless diamond and a light blue …