The Color Origin and Evaluation of Natural Colored Diamonds

Abstract

Diamond is widely concerned and loved by people due to its rarity, beauty and beautiful implication in love. Color is very important in colored diamonds’ evaluation, and diamonds are extremely colorful. Scholars have done some researches on the color origin of colored diamonds, but the types of diamonds studied are not comprehensive, and the influence of these color origins on diamonds’ color evaluation has not been systematically clarified. Therefore, this paper focuses on the color of diamonds, arranges a large number of documents, and systematically summarizes and discusses the color and evaluation of colored diamonds. Firstly, the five color systems on which the description of diamond color depends, including principles, advantages and limitations, are described and compared. Then, the types and action mechanism of all color origins of colored diamonds are expounded in detail and comprehensively. In addition, the influence of factors other than the characteristics of diamond itself on diamond’s color evaluation are discussed, including cutting, fluorescence and phosphorescence. Finally, the intelligent color evaluation of colored diamonds is prospected, which will be widely used in the future. And this review will provide reference for the color evaluation of other colored gemstones.

New Insights into the Coloration Mechanism in Spessartines and the Impact of Munsell Neutral Grey Backgrounds

“…Lv et al analyzed how gemstones' composition affects their color parameters, finding the genesis of the body color of opal [20]. Studies also involve Xiuyan jade [21], tourmaline [22], alexandrite [23][24][25], diamond [26], tsavorite [27,28], garnet [29][30][31], amber [32], chrysoberyl [33], opal [34], etc.…”