Topaz is mined in several countries around the world. Natural blue topaz birthstones are dark, greyish blue in color, or "London blue", the result of standardized radiation therapy, and take 3-4 years to produce a deep blue color.
London Blue is a traditional December birthstone made of aluminium, fluorine and silicate minerals.
London Blue topaz Gem will improve your communication skills and express yourself in a meaningful way when speaking or writing. The precious stone is fragile and brittle, with a glass-like sheen and deep cracks. You can find blue topaz birthstones in dark to cool blue, also known as sky blue, London Blue, or Swiss blue, depending on the intensity of the hue.
Topaz London blue is usually produced by exposure to radiation from nuclear reactors. When topaz is exposed to fast neutrons, the radiation changes the color center, producing a deep blue color. Subsequent heat treatment is usually used to reduce the ink color. Material treated in this way is likely to be radioactive and may require several months of storage before the radioactivity decays to safe levels.
Wearing London blue topaz can boost emotional well-being, as this calming blue color changes depending on the mood of the wearer.