Natural London Blue Topaz
Topaz is mined from several countries around the world. Blue colored natural topaz is very rarely found. The dark, greyish blue coloration, or “London blue,” of these natural topaz gemstones results from a standardized radiation treatment that requires 3-4 years to produce the deep blue coloration. Wear natural London Blue Topaz with a specific medium blue color to live a calm and stress free life.
- Color: London blue topaz is a medium to dark greyish blue, sometimes described as “steely” or “inky.”
- Origin: Brazil, Afghanistan, Australia, Myanmar (Burma), China, Germany, Japan, Madagascar, Mexico, Namibia, Nigeria, Pakistan, Russia, Zimbabwe, Sri Lanka, Ukraine, and the USA. However, natural London blue topaz rarely exists and is generally found very pale in color. It is often found in Brazil, but a few were explored in the U.S. in Texas.
- Chemical Composition: Al2SiO4(F,OH)2 Fluor containing aluminium silicate
- Cut: Round, Oval, Pear, Square, Emerald, Marquise, Trillion, Heart
- Specific Gravity: 3.49 – 3.57
- Refractive Index: 1.609 – 1.643
- Hardness: 8
Formation
Topaz is exposed to radiation (a process known as irradiation) and then usually heated to produce striking blue colors. A deep blue enhanced topaz is known as “London blue.”
Birthstone
London blue topaz is the traditional birthstone for December made up of Aluminium and fluorine, silicate minerals.
Unusual Properties
London Blue Topaz Stones will heighten your ability to communicate better and express yourself meaningfully when speaking or writing. This semi-precious stone is fragile and brittle, with a sheen akin to glass and a profound cleavage. You can find blue topaz birthstones in dark to cool blues, also called Sky Blue, London Blue, or Swiss Blue, depending on the intensity of the hue.
Treatment
Topaz London blue is typically produced by exposure to radiation in a nuclear reactor. The radiation changes the color centers when topaz is exposed to fast neutrons, producing a deep blue color. Subsequent heat treatment is often used to lighten the inky color. Material treated this way is likely radioactive and may require several months of storage before the radioactivity decays to safe levels.
Usage
Rings, necklaces, bracelets, and pendants
What We Supply
Best quality London Blue Topaz in above mentioned Cut in different sizes.
We offer Blue Topaz birthstones in three shades.
Natural London Blue Topaz
Natural Swiss Blue Topaz
Natural Sky Blue Topaz
GEMS n GEMS is one of the most reliable sources for certified natural London blue topaz birthstones in Bangkok, Thailand. We have completed almost thirteen glorious years dealing with a wide variety of premium quality natural & synthetic gemstones in various colors, sizes & patterns.