The Properties of Sapphires  Sapphires are known for their durability and beauty. They come in a variety of colors including pink, blue, yellow, orange, purple, and green. Each color has its own unique properties and characteristics.  Sapphires are extremely hard and durable, making them an ideal choice for jewelry. The hardness of sapphires ranks a 9 on the Mohs scale. This is second only to diamonds which rate a 10 on the scale. This makes them resistant to scratches and chips, making them the perfect choice for rings and other pieces of jewelry that will be worn often.