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Diffusion treatment is a popular method for treating star sapphire, since the treatment will increase the asterism (the star effect in sapphire and ruby). The diffusion process may reach a depth of half a millimeter into the gemstone.
Blue diffusion-treated sapphires are be- coming more prevalent than ever before. The diffusion technique, which involves the addition of color-causing chemicnls during heat trentment, results in a thin layer of color at the surface of colorless or light-colored sapphire.
28 maj 2020 · The key indicator of diffusion is color bleeding — dark concentrations of the stone’s color — around pits and fractures that extend to the stone’s surface. Other indicators of treatment include melted crystals, spotty stripes of color, fractures around inclusions, and pits on the surface.
It involves heating a sapphire to 10,000 degrees in a vacuum chamber, which creates a bond between sapphire and a lattice gas such as argon or nitrogen and then adds an element into it to create vivid colours into the gem. Diffusion using Beryllium and Titanium.
Learn how to spot diffusion treated gems with a simple immersion test. This common treatment for sapphire can significantly reduce their value and prevents re-cutting and re-polishing.
Diffusion treatment is divided in two parts: Surface Diffusion; Beryllium Diffusion (also known as Bulk Diffusion) Surface Diffusion. Nature of gemstone: This is applied basically on corundum. Experiments are also being conducted on other stones such as topaz. Materials used: High temperature furnace along with relevant chemical agents.
Lattice diffusion is a treatment process that uses heat and chemicals to diffuse an element into a gemstone to artificially change its color. Lattice diffusion–treated sapphires can be any color. In some cases the added color is shallow. In others, it goes all the way through the stone.
