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Long associated with royalty, sapphires are some of the most popular (and expensive) gems in the world. Our sapphire buying guide will help you…

Our spinel buying guide can help you learn how spinels are graded and how to identify a high-quality stone or a bargain in the rough.

Commentaries on the foundation stones of the Book of Revelation influenced the development of the Western birthstone system. Learn more about…

Citrine’s affordable autumn hues make it a great option for trendy jewelry. Read about the quality factors for this stylish gem in our citrine…

Garnet symbolism is rich and varied. The January birthstone has inspired many legends and popular associations with love, friendship, light,…

A popular variety of colored quartz, rose quartz makes a durable jewelry stone. Although commonly cabbed and carved, more transparent material…

Decorative, patterned forms of agate are excellent natural gems. Learn more about agate’s mesmerizing patterns in our agate buying guide.

Gem collectors prize tugtupite, the “Reindeer Stone,” for its rich colors and intense reaction to ultraviolet light. Sporadically used in jewelry,…