Topaz Comes in a myriad of colors. Some of the colors are White, Colorless, Blue, Red, Green, Yellow, Orange, Brown, Pink, Purple, Gray, Multicolored and variations of these colors. The Imperial Colors, golden, pinkish orange to orange are the rarest and most expensive. The Blues are irradiated. Topas at 8 in hardness is a durable stone and has good brilliance.