Blue Topaz Good Gemstones supplies Ring- 925 Silver Blue Blue Topaz Ring – Blue Topaz Ring, 925 Silver, Blue, jewelry accessories, Gemstones rings, girlfriend gift , birthstone ring, great item, Ring jewelry accessories, Blue Topaz Good Gemstones, Ring gift for girlfriend **** Most topaz is clear (white) when it is mined. Then it is treated by vario us methods to become a colored gemstone. Swiss blue and london blue topaz is treated by radiation – sometimes taking years of a cooling period to complete before the gems are able to be handled. A new process was developed by Azotic, a us-based science research company, to apply a durable coating to the pavilion (bottom) of the gemstone with optical properties to give the gem color. The general name for this treatment is “mystic” and they have developed over six hundred colors of gemstones – the most popular are the mystic fire green, the pure pink, and the neptune garden.