Topaz is available in several varieties, with the most popular kinds used in pendants being blue topaz, imperial topaz, and white (colorless) topaz. Blue topaz is through a long way the maximum sought-after, mainly in its London Blue and Swiss Blue shades. Imperial topaz, which is a golden to reddish-orange hue, is considered the maximum precious and rarest form of topaz. White topaz, that is colorless, is every so often used as a more cheap opportunity to diamonds due to its brilliance and readability. other colour variations which include purple, yellow, or green topaz also are available, even though they may be rarer and often greater costly. each colour has its precise attraction, so the selection of topaz for a pendant often relies upon on non-public choice and price range.