Gemological formulas identify the chemical composition of gems and minerals. Learn what the symbols, numbers, and parentheses mean.
Whether you're new to faceting or an old pro, these quartz polishing survey results can help you choose a lap, polish, and lubricant combo for your gem.
Onyx symbolism and lore is filled with negative associations. Learn how people have counteracted these purported effects and enjoy this beautiful, dark gem.
Quartz color treatment results vary due to the stone's origin. Learn the effects you can achieve with different materials and radiation and heat techniques.
The Quartzsite gem shows attract gemologists and rock hounds from around the world. Learn what to expect and how to shop at these huge annual events.
Showcase the amazing inclusions in minerals like rutilated quartz in a gemstone pendulum design. Learn how to facet these gems into stunning jewelry pieces.
Everything you ever wanted to know about chrysoprase. Find value guidelines, scientific data, expert comments, and more in our Gemstone Listings.
Today's custom gem cutters use faceting equipment for precision work and design inspiration. Take a look at the toolkit of the new lapidary renaissance.
Streak testing is a destructive gemstone test rarely used by gemologists. Most gems leave no streak. Learn which gems do and what color they leave.
Gemstone heat treatments can increase the beauty and value of many rough pieces. Learn how to conduct the most common procedures safely.