Topaz Visible Spectra (350 - 1250 nm)

Topaz can be naturally blue, pink, and various shades of brown or amber. Most blue topaz on the market has been artifically colored with irradiation. The pink color comes from Cr3+ and the amber and brown colors come from radiation damage. You can view a suite of crystals ranging from the natural colorless, irradiated brown, and irradiated plus heat-treated blue.

Link to an extensive collection of references to mostly color and visible spectroscopy of topaz.