Learning Center

Advanced Gemology Topics

Advanced gemology topics on a wide variety of technical subjects such as gemstone treatments and inclusions.

Gemstone Physical Properties

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

Gemstones and Refraction Liquids

Gemologists use refraction liquids to identify gemstone refractive indices (RI). Learn about the properties of these liquids and safe RI testing…

HPHT Diamond Treatments

HPHT diamond treatments can only be positively identified with costly equipment. However, you can learn to assess the probability that a stone…

Quartz Color Treatments

Quartz color treatment results vary due to the stone’s origin. Learn the effects you can achieve with different materials and radiation and heat…

Gemstone Radiation Treatment

Gemstone radiation is a common but little understood technique for altering gem colors. Learn how it works and what gems usually receive this treatment.…

Emerald Fillers and Treatments

Emerald fillers can improve the beauty of these gems but also have some drawbacks. Learn how to choose the right filler treatment for a particular…

Shells and Sea Shells

Sea shells are one of our most ancient decorations. Our prehistoric ancestors used to string them into necklaces or hang them from cords as pendants.…

Fossilized Organisms

Most people who have an interest in gemstones or nature have seen petrified wood, but fewer are aware of the many other types of fossilized organisms…

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• Discover the 17 practical steps to gemstone identification (even if you’re just getting started with gemology)

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• Explore a range of gemological tests… not only will you get familiar with the process but also time-saving shortcuts!