Corundum is a type of mineral made up of aluminum oxide. It is found naturally in a variety of colors and is one of the hardest materials known to man. Corundum is often used in the making of watches as it is incredibly durable and resistant to scratches. It is also known for its remarkable luster and can be polished to a glasslike finish. Corundum is a great choice for those looking for a classy, durable watch.
