Learning Center

Gemstone Testing and Identification

All about how to identify gemstones using a number of methods.
Gemstone Examination Lesson

Learning how to conduct a gemstone examination takes practice. Follow an expert gemologist step-by-step through tests of five unknown samples.…

Enhanced Gem Inclusions

Gem treatments can affect a stone’s value and stability. Learn how the most common procedures work and how to identify enhanced gem inclusions.…

Identifying Opal Patterns

Opal connoisseurs all have their favorite opal patterns. Learn how to identify the patterns of these beautiful gems with plenty of photo and video…

Eight Opal Types Explained

Opal is a complicated gemstone, and many factors affect its price. Learn how to distinguish these eight opal types and how they differ in value.…

Identifying Synthetic Diamonds

Although most manufacturers disclose their synthetic diamonds, some resellers don’t. Learn how to identify these lab-created diamonds.…

Identifying Synthetic Gems

Distinguishing between natural and synthetic gems is a critical skill for gemologists. Learn about gem making processes and the telltale signs…

Destructive Gemstone Testing

Destructive gemstone testing, done carefully, can help gemologists with difficult gem identifications. Learn the right techniques with our…