GIA is proud to provide the most comprehensive research in the industry with a world-renowned field gemology team and a dedication to acquiring colored stones directly from the source. Our ...

Opals with an unusual purple bodycolor and strong play-of-color have recently appeared in the market. Reportedly from a new deposit in Mexico, they have a vivid bodycolor unlike that of any natural ...

The GIA Laboratory-Grown Diamond Report includes full quality assessment with a plotted clarity diagram. Color and clarity specification are described on the same scale as the GIA Diamond Grading ...

This is the second part in a three-part series on the origin of color in gem materials. This article discusses colors produced by (1) processes that involve multiple atoms (e.g., blue sapphire, ...

The unique beauty of gem sapphires from Kashmir has brought fame to a locality about which little has been reported in recent years. After an initial burst of activity 100 years ago, the production of ...

If you were born in the month of June, you are lucky enough to have three birthstones to call your own. June is one of only three months (the others are August and December) that has three birthstones ...

This large Australian light opal cabochon weighs 117.85 carats. Small play-of-color flashes of orange and green predominate in a pinfire pattern, with spots of a more muted blue over a grayish ...

The intense green of this chrome tourmaline from Tanzania resembles the color of emerald. Tourmalines come in a wide variety of exciting colors. In fact, tourmaline has one of the widest color ranges ...

This gem at the Chicago Field Museum of Natural History is inscribed with noor jahan, or “light of the universe.” - Courtesy "Gems and Gemstones:Timeless Natural Beauty of the Mineral World" by Lance ...

Top-quality moonstones accent this beautiful platinum and diamond pendant. Moonstone has fascinated designers and gem connoisseurs for centuries. - Courtesy David Humphrey When buyers select ...

Consumers know diamond from the slogan “A Diamond is Forever”. With some care considerations this is relatively true. The Asscher cut was popular decades ago and is again a very popular cut style.

Figure 1. Dr. Ahmadjan Abduriyim hosts an episode of “Beautiful Gem Stories,” filmed on location at the Montepuez ruby mine in northern Mozambique. Photo by Tomoaki Miyake. The unique allure of ...