Kyanite is a very useful, durable and affordable gemstone. Kyanite is a blue-grey mineral used as an ornamental stone. The hardness of kyanite is similar to that of sapphire, therefore it has been used as a substitute for sapphire in jewelry. The main sources of kyanite include Brazil, India, Sri Lanka and Madagascar. Kyanite is known for its excellent hardness, durability and toughness.
