Sardius, also known as carnelian, is a reddish-brown gemstone belonging to the chalcedony family. It is primarily composed of silicon dioxide and is valued for its vibrant color and translucence. Sardius has been used in jewelry and decorative items for thousands of years, often associated with protection and courage. In ancient times, sardius was highly regarded by various cultures, including the Babylonians and Egyptians. It was often engraved with symbols or images and used in signet rings and amulets. Today, sardius remains popular in modern jewelry, appreciated for its beauty and historical significance.