The treatment of mesh diffusion is sometimes considered a serious treatment that is difficult to detect. Beryllium diffusions can produce orange, yellow and pink colors. When the corundum is heated, the grille widens so that these small rays can be scattered into the gem and trapped into the cage when the corundum is left to cool.Ĭompressed ions prevent the corundum from shrinking to its normal size, which creates a defect that changes the color of the light passing through the stone. The diffusion mesh is heated in the presence of a substance to be exposed to sapphire tiny metal ions. Some sapphires are processed by a process known as “cage diffusion”. If such transactions had been used, sellers should disclose the types of treatments available to potential purchasers of stone. The yellowish, turbid and semi-transparent corundum is heated to obtain transparent and bright blue colored stones. Some rough materials that do not carry a blue trail can be heated to produce a magnificent blue.

Ruby & sapphire stone