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Diamond Rarity, Quality, and Cost

Word is out that diamonds aren’t that rare. So, why are they still so expensive? Learn about diamond rarity and quality and how they impact cost.…

Advanced Gemology Equipment

We often recommend that novice gemologists send gems that are difficult to identify to a laboratory for testing. Gemological and mineralogical…

Destructive Hot Point Testing

Hot point testing can determine if some gem materials are plastic imitations. It can also reveal if a stone is treated with wax or plastic. By Donald…

Gemstone Magnetism

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

Ultraviolet Testing

Gemstone identification typically starts with measuring a specimen’s refractive index (RI) and specific gravity (SG). These two tests…