Spinel

Known for stunning, saturated hues, tourmaline is a colorful and modern gemstone. Read about quality factors for this gem in our tourmaline buying…

We are GEMS OF EAST AFRICA, a London UK-based gemstone dealer with our own buying office in Tanzania. Suppliers to the global gem community since…

Learn the scientific definition of crystal used by gemologists and answer some basic questions about what is and is not a crystal.

The Usambara effect is a gemstone color change phenomenon distinct from pleochroism or the alexandrite effect. Tourmaline and other species…

Raw stone jewelry is trending. Read this article for tips on incorporating raw stones into your jewelry designs and cleaning these gems.

When buying gems, gemologists must temper their excitement with an analytical eye. Test your gem identification skills with these quizzes.

These gemology cheat sheets review gem color and clarity grading, specific information on evaluating diamonds and opals, and basic gem identification…

Test your knowledge of refractometer gem analysis with this mini-quiz. You can review material on any question you miss at the end of the quiz.

A dichroscope can distinguish the colors of pleochroic gems. Learn how gem cutters can use this tool to choose the best faceting designs for these…