Advanced Gemology Topics
Advanced gemology topics on a wide variety of technical subjects such as gemstone treatments and inclusions.
Why do certain gems change color under different lights? Explore gemstone color change phenomena and the difference between natural and artificial light.
Gemologists use refraction liquids to identify gemstone refractive indices (RI). Learn about the properties of these liquids and safe RI testing procedures.
Gemologists are seeing more and more HPHT diamonds. While detection equipment is costly, you can assess the likelihood of treatment without it.
Identifying inclusions can help gemologists identify gems, but it’s a hard skill to master. Our 4-part series on gemstone inclusions will get you started.
Measuring “over the limit” (OTL) refractive indices can help distinguish diamonds from simulants. You can do this with a simple upgrade to your microscope.
How do gems likes rubies and red beryls get their red color? Learn the role impurity ions play in the coloration of these and other gemstones.
Gemstone radiation is a common but little understood technique for altering gem colors. Learn how it's done and what gems usually receive this treatment.
Learn about the history of quartz treatment, including why it took so long to treat quartz with any consistency, in this informative article.
Learn how gemstone physical properties, like hardness and heat sensitivity, affect a gem's durability and cut and help gemologists with identifications.
Quartz color treatment results vary due to the stone's origin. Learn the effects you can achieve with different materials and radiation and heat techniques.
Emerald enhancements involve a variety of different types of fillers, impregnations, and dyes. These treatments can improve the beauty of emeralds.
Explore the amazing world of gemstone photomicrography. These tips can help you view and photograph spectacular inclusions found inside many gems.
Both beryl and tourmaline develop hollow, or "growth" tubes. The gem cutter sees many more of these than the gemologist does, as most are cut away.
Identifying garnets by species is complicated. Learn how to use refractive index, hue, and absorption spectrum readings to simply the separation process.