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 morganite. Find value guidelines, scientific data, expert comments, and more in our Gemstone Listings.
Emerald treatments, such as oiling, are very common. Learn what these techniques do, how emeralds are graded, and what green gems make great alternatives.
Emerald enhancements involve a variety of different types of fillers, impregnations, and dyes. These treatments can improve the beauty of emeralds.
Emerald crystals can grow very large. Learn about some of the world’s largest emeralds, old and new, uncut or faceted, rough or carved.
In the gem design stage of jewelry making, faceters evaluate a stone's qualities. Learn how to choose a cut for a gemstone as unique as your personal story.
Gemstone heat treatments can increase the beauty and value of many rough pieces. Learn how to conduct the most common procedures safely.
Learning how to conduct a gemstone examination takes practice. Follow an expert gemologist step-by-step through tests of five unknown samples.
There's more to aquamarine color than blue. Most natural stones start blue-green and are heated to blue. Learn the pros and cons of this treatment.
Carats are the units used to measure gem weight and one of the main factors in gem grading. Learn what affects the value per carat of various gem species.