Gemstones belonging to the family of Garnet occur in a multitude of colors except for blue and are available in several varieties including almandine, andradite, grossular, pyrope, spessartine, and uvarovite. Except andradite and uvarovite, all the other types of Garnets are available in Sri Lanka, with some displaying asterism, chatoyancy, and a color change when viewed under different types of lighting. All garnets have essentially the same crystal structure, but they vary in chemical composition. There are more than twenty garnet categories, called species, but only five are commercially important as gems. Garnet types found in Sri Lanka with commercial value include;