London Blue Topaz
There are 3 hues of blue that white topaz is treated to by heating & neutron/electron treatment:
London Blue Topaz can be achieved by bombarding the stones with heat, neutron and electron treatment. The stones become radioactive after Neutron treatment and can only be released into the market for sale after they have passed the certified radiation level.
GSC carries all types of London BT Stone, including Rough, Preform & hand-cut & machine-cut stone (calibrated and free size).
The color of London Blue topaz is permanent.