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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…