What is london blue topaz?

Large, vivid blue topaz specimens from the St. Anns mine in Zimbabwe were found in the late 1980s. Colorless and light-blue varieties of topaz are found in Precambrian granite in Mason County, Texas within the Llano Uplift. There is no commercial mining of topaz in that area. read more

London blue topaz is a medium to dark grayish blue, sometimes described as "steely" or "inky". Many London blue gems have a slightly greenish tone when viewed from certain angles. The reason why blue topaz is so reasonably priced is that topaz is a very abundant material. read more

Swiss blue is the most expensive blue topaz color and its nearly the same as sky blue only slightly darker. London blue is the darkest of the three but very slightly greenish blue in hue. Sky blue and Swiss blue colors don’t have any greenish components. read more