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agate buying - dendritic agate bracelet with pearls
Agate Buying Guide

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

gemstone transparency - carnelian
What Is Gemstone Transparency?

Gemstone transparency describes how much light passes through a gem and how it scatters. Learn what causes a gem to be opaque, translucent, or transparent.

Agate Value, Price, and Jewelry Information

Everything you ever wanted to know about agate. Find value guidelines, scientific data, expert comments, and more in our Gemstone Listings.

How To Make A Rock Lamp

With the right tools and a little drilling know-how, you can create a rock lamp with an agate or jasper base, an oil lamp, and a glass lantern.

Grading Gem Carvings

Gem carvings are judged on material, workmanship, and artistry.  Learn how to apply these criteria to a piece with our step-by-step guide.

“Genesis And Classification Of Agates And Jaspers: A New Theory” Book Review

“Genesis And Classification Of Agates And Jaspers: A New Theory” insightfully explains the formation of these gems and features beautiful photos.

An Introduction To Turkey’s Gemstones

Turkey's gemstones include well-known species such as diaspore, chalcedony, and jade, as well as unusual specimens of lesser-known gems. Learn more here.

Where Can You Find Agate Stones Forming?

Agate stones typically form slowly in the cavities of ancient hardened lava flows. Learn where you can see this process occurring today.