inclusions

Appraising emeralds is a key skill for all jewelers and gemologists. Learn how to evaluate the quality of these rare green gemstones.

The modern August birthstone, peridot has been prized as a jewelry stone since ancient times. Always green in color but with considerable variations,…

Emerald fillers can improve the beauty of these gems but also have some drawbacks. Learn how to choose the right filler treatment for a particular…

First-time gem buyers may find diamond grades confusing. Our consumer guide explains how diamonds are evaluated and gives advice on how to choose…

Our ruby buying guide can help you learn how rubies are graded, what to avoid, and how to identify a high quality stone or a bargain in the rough.

Trapiche emerald gems are some of the world’s rarest emeralds. Learn where they’re found and how their characteristic “spoked wheel” patterns…

Curved striae or lines are a telltale sign of synthetic ruby and sapphire. If you’re having trouble seeing them, here are some helpful tips.

Emerald treatments, such as oiling, are very common. Learn what these techniques do, how emeralds are graded, and what gems make great green alternatives,…

Although Tanzania is a source of rubies, so-called Serengeti rubies are more likely to be garnets. Learn more about rubies and misleading gem names…