Usually, the original topaz stone is colorless and pale in appearance, however, topaz is allochromatic in nature which means imperfection in the atomic structure of stone which allows the stone to tint with different colors.
Thus, the varieties of colors which this stone resembles are due to imperfection caused in the atomic structure of the stone. Topaz is also a pleochroic gemstone and can have varied color intensity when viewed at different angles. Due to its good cleavage and pleochroic nature.
Topaz Gemstone: is a hard and durable gemstone, and will not dissolve in most chemical solvents. However, it does have perfect cleavage which can make it prone to chipping or forming flaws if banged hard.