ARI™ by Presidium - Diamond, CVD/HPHT, Moissanite Tester quote A comprehensive new book from

A comprehensive new book from gemology expert Renée Newman covers every facet of this beloved gem

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Becoming A Connoisseur: Essentials

Prior to the 16th century the technology did not exist to either cut or polish a diamond

ARI™ by Presidium - Diamond, CVD/HPHT, Moissanite Tester quote A comprehensive new book fromThe Presidium ARI (Advanced Refractive Index) is a professional, handheld PRESIDIUM DIAMOND VERIFICATION INSTRUMENT designed to accurately distinguish colorless natural diamonds from CVD HPHT lab grown diamonds and all types of moissanite. Engineered for both loose stones and mounted jewelry, including closed back settings, it delivers dependable identification in just 3 seconds. Using advanced UV light absorbance technology, ARI analyzes the optical