Sapphire is in many respects one of the most important of the colored stones. With a hardness of 9 on Moh's scale, sapphires are extremely hard and second only to diamonds in this respect. Tough and durable, they are suitable for use in any kind of jewelry. Primary deposits are in Sri Lanka (Ceylon), Thailand, Australia and Montana, US. The most valuable color of sapphire is a cornflower blue color, known as Kashmir sapphire or cornflower blue sapphire. Another extremely valuable Sapphire form is the very rare, orange-pink Padparadscha.