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What are the 4 Types of Precious Stones?

Image of assorted precious stones

In the field of Gemology, four gemstones in the world have earned the classification of precious stones. These “big four” are diamond, ruby, sapphire, and emerald. In this article, we’ll take a deep dive into each of these gems and highlight interesting facts along the way, courtesy of the Gemological Institute of America (GIA).

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