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

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 …

Nov 21, 2025 · Explore the GIA Guide to Diamond Engagement Ring Shapes and learn the differences between round, oval, marquise and more. Make a well-informed decision when choosing the perfect …

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 …

This framework is both a way to better understand your diamond, and to ensure accuracy in the evaluation of your diamond’s unique characteristics. It is the best way to ensure clear information, …

Presents the first scientific and historical study conducted on the 2.33 ct Winston Red, the fifth-largest known Fancy red diamond in existence.

Our GIA Laboratory-Grown Diamond Report provides detailed color and clarity specifications as well as a plot of the stone’s clarity characteristics. We are able to scientifically determine whether a diamond …

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

Museum The GIA Museum in Carlsbad, California introduces visitors to the vast and vibrant world of gems and jewelry. Our exhibits, spread throughout the campus, display the science and beauty of …