Throughout the ages, the healing properties of gemstones, their beauty, and magic have been recognised and harnessed. As far back as the Stone Age, men and women wore crystal jewellery. They had a protective, as well as a decorative function, guarding their wearer against harm. The ancients employed gemstones for protection, adornment, healing and for seeing into the future. Gemstones were frequently worn and carried by ancient Egyptians as amulets and charms. Greek mythology frequently refers to gemstones, and many have been discovered in the tombs of Chinese rulers. Gemstones were used extensively in ceremonies and initiations by the Native Americans, the Mayans and Aztecs. The breastplate of the Jewish High Priest was set with precious stones; it conveyed power to the wearer.