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.
Flint and mozarkite are types of chert. While flint is known for its practical use, mozarkite is a colorful variety of chert that can be made into jewelry.
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.
Learn what factors determine the average faceting yield of a single piece of gemstone rough.
Should you wear chrysoprase jewelry only at night to protect the gem’s striking green color? Learn the facts here.
Jasper is an opaque, solid or patterned variety of cryptocrystalline quartz which consists of very tiny quartz crystals colored by various mineral impurities.