Decorative, patterned forms of agate are excellent natural gems. Learn more about agate's mesmerizing patterns in our agate buying guide!
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.
Everything you ever wanted to know about agate. Find value guidelines, scientific data, expert comments, and more in our Gemstone Listings.
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.
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” insightfully explains the formation of these gems and features beautiful photos.
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.
Agate stones typically form slowly in the cavities of ancient hardened lava flows. Learn where you can see this process occurring today.