Tissa Vitarana critical of budget in LSSP's 86 the ...
The stone, which is opaque on the outside in parts, has clear blue patches inside. Corundum is the family of gem made up of the mineral aluminum oxide, including geuda, blue and red sapphire. Test conducted on samples obtained form the stone had confirmed that it had refractive index of 1.76 to 1.77, the same as sapphire and hardness of 9.0 ...
