Most gemstone-quality kyanite is blue in color. However, kyanite can be clear, green, black, and rarely purple. Some kyanite gemstones are pleochroic (appear to be different colors when viewed from different directions).

Blue kyanite stones can be found in a continuous color range between clear and dark blue. The most popular kyanite gemstones are transparent with a deep sapphire-blue color. Some deep blue stones are shown in the photos on this page. Transparent blue kyanite with a lower color intensity might look like blue topaz or blue aquamarine.