London Blue Topaz

London blue topaz gemstone tends to be rare and fairly expensive. It has good hardness and brilliance. It is true for the gems like sapphire, spinel and tanzanite, as they are darker blue gems. These all come in the category of expensive ones and there are many more which are less expensive like kyanite, iolite lapis lazuli and fluorite, which are deep blue in colour and are saturated. Blue topaz is considered to be the stones for everyday jewellery. It is also reasonable in cost. As we have seen that it is found in both darker and lighter tones. It is also known as the sky blue topaz, London blue topaz and Swiss blue topaz. London blue is regarded as the most valuable gemstone all over the world. It has a medium to dark greyish-blue. It can also be described as inky. Viewed from certain angles, they have a slightly greenish tone. Topaz is a very abundant material, so it has reasonable prices. Natural topaz occurs in white and brown. The colour of the topaz can be changed by the irr