September's birthstone is sapphire. Sapphire is a gemstone known for its beautiful blue color and is highly valued around the world.

Sapphire is a type of corundum, an aluminum oxide mineral. Blue is generally the most well-known color, but other colors also exist. For example, a pink sapphire is sometimes called a "pink sapphire," and a yellow sapphire is sometimes called a "paddy paddy." However, the common image of sapphire is blue.

Blue sapphire has a noble and deep color, and the deep blue called royal blue is especially valuable. Sapphire has been used as jewelry for royalty and nobility since ancient times, and has been considered a symbol of nobility and preciousness.

Sapphire is extremely hard and durable. Therefore, it is suitable for use as jewelry. Popular as wedding rings and special gifts.