Azotic topaz is a color-enhanced variety of colorless topaz and obtains its unique rainbow-like colors through an extremely thin metallic coating of film that reflects light in a variety of colors and interesting patterns.All the colors of the rainbow are displayed in an amazingly vibrant kaleidoscope in one stone. This designer gemstone is an affordable eye catching stunner. Like any gemstone, Azotic topaz can be wiped clean using a soft cloth and a mild soap or detergent. Rinse to remove soapy residue.