A Beginner’s Guide To Common Gemstone Heat Treatments

The following excerpt from the International Gem Society provides basic information on why some gemstones are heat treated. For the full article, see see https://www.gemsociety.org/article/gemstone-heat-treatments.

A Beginner’s Guide To Common Gemstone Heat Treatments


Step 2: Advanced Gemology

LESSON 6

“Aquamarine Crystal” by greyloch is licensed under CC By-SA 2.0
“Aquamarine Crystal” by greyloch is licensed under CC By-SA 2.0

 Gemstone heat treatments can turn mediocre pieces into items of great beauty. Heating a gem to a specific temperature and then cooling it is a common procedure in the gem world. This can improve a gem’s color and sometimes even its clarity. Such treatments do a number of good things for our budgets as well as the environment, since more rough material coming out of the ground becomes useful for its beauty. Here you’ll find a summary of the most commonly used gemstone heat treatments and tools as well as some safety tips for novice gemologists and gem cutters.

A Note On Corundum Heat Treatments

Ruby and sapphire are some of the most commonly heated gemstones. However, these gems aren’t discussed in this article. A standard electric oven can’t reach the …



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