The green turquoise cabochon, from an American mine, might become part of a designer’s unique jewelry piece. The even blue color of the cabochon on the right would be called “Persian blue” in the ...
Diamond is available in a range of sizes and qualities to fit every consumer's tastes. One of the first things most people learn about diamonds is that not all diamonds are created equal. In fact, ...
Laboratory-grown diamonds have their own distinct characteristics, including inclusions and other features, which allow GIA scientists to distinguish them from natural diamonds. These clarity ...
Figure 1. This 3.17 ct round brilliant cut diamond owed its Fancy Deep green color to irradiation with radioactive salts. Photo by Jian Xin (Jae) Liao. Recently submitted to the East Coast laboratory ...
Cultured pearls come in different sizes, shapes, and colors. Perhaps the best-loved gems of all time, pearls—both natural and modern cultured pearls—occur in a wide variety of colors. The most ...
Fine-color, large, and eye-clean (lacking visible inclusions) rubies like this 11.01carat (ct) stone from Myanmar (formerly known as Burma) are extremely rare and valuable. – Photo: Robert Weldon/GIA.