sapphire

Lab-grown diamonds are becoming popular options for engagement ring stones. Learn the truth about these gems in our FAQ and make your own informed…

Learn about tourmaline formation, where tourmaline is found, and the unusual geological conditions that give this stone its fantastic colors.…

Although gemstone magnetism isn’t commonly tested, it can help gemologists distinguish similar looking gems. Learn how to analyze this property.…

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

How do gems likes rubies and red beryls get their red color? Learn the role impurity ions play in the coloration of these and other gemstones.

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…

In this golden age of pearls, a wide variety of shapes, sizes, and colors are available. Our pearl buying guide can help you select a pearl you’ll…

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.