pink gems

Teal sapphires feature blue and green colors in a beautiful combination. Learn all about these gems and why they might be the next big thing in sapphires.…

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

Cutting tourmaline can be difficult. Learn how to cut tourmaline, including faceting techniques to minimize the risk of damaging your stone.…

Identifying gemstone treatments is difficult even for experienced gemologists. Learn about the many different ways gem color and clarity are…

Although gemstone magnetism isn’t a commonly tested gemstone property, it may be useful for making quick separations outside the lab. By Richard…

Step 2: Advanced Gemology Lesson 2 Back to syllabus The optical properties of gems attract our eyes and can give a cut stone a unique character. However,…

The optical properties of gems attract our eyes and can give a cut stone a unique character. However, gemstone physical properties are also important.…

Learn how to spot diffusion treated gems with a simple immersion test. This common treatment for sapphire can significantly reduce their value…

The AGTA has proposed the use of gemstone treatment codes to promote disclosure and a common language for these procedures. Learn what these codes…