The causes of colour of untreated and heat treated padparadscha from Sri Lanka are compared with the colouration of beryllium diffusion treated samples from Ilakaka, Madagascar, and from Songea, Tanzania.

• 对来自斯里兰卡的未处理和热处理帕帕拉恰蓝宝石的颜色成因与来自马达加斯加 Ilakaka和坦桑尼亚Songea的Be扩散处理蓝宝石的颜色成因进行了对比。