Sapphire is a deep blue stone that is a variety of corundum. It consists of aluminium oxide with traces of iron, magnesium, chromium and titanium. Sapphire is part of the hexagonal crystal system and scores a 9 on the Mohs hardness scale. It is a precious gemstone that is highly sought after. The meaning of Sapphire is joy and wisdom, it is also associated with truth and loyalty.