Gemmological Characteristics of Light Pink to Pink Beryls

In this paper，the gemmological characteristics of light pink to pink beryl samples from jewelry market were studied.Compared to emerald and aquamarine，the colour of light pink to pink beryls is obviously different，as well as different refractive index and density.Conventional gemmological instruments，infrared spectrometer and X－ray fluorescence spectrometer were used to systematically study the pink beryl samples.According to the refractive index results，the pink beryls are divided into three groups，and the yellowish green beryls and common aquamarines are divided into two groups.It is found that the refractive index and density of pink beryl are positively correlated.As the concentration of Cs increases and the concentration of Rb decreases，the refractive index and density increase.The refractive index of aquamarine varies between 1.577and 1.583（±0.017），while the refractive index of pink beryl is up to 1.61.