Identification Features of Partially Bleached and Filled Nephrite

As a new method of treatment for nephrite，partial bleach and filling are very popular but because there are other areas of samples that are not treated and natural characteristics are maintained，so partially bleached and filled gems are fraudulent.The characteristics and identification of partially bleached and filled nephrite are studied by using image measuring instrument and FTIR，combined with conventional gemmological inspection instruments.The result shows that some areas of partially bleached and filled nephrite have obvious orange peel structure and intense ultraviolet fluorescence.The authors believe that infrared transmission analysis is the most effective method to identify partially bleached and filled nephrites.