If you desire a bracelet consisting of a material representing both protection and knowledge, the tiger eye would offer you the shield you need. Used in ancient Egypt, the tiger eye was the stone of vision and protection. Adorning the statues of deities, most specifically the eyes, the stone was believed to be an all-seeing and all-knowing eye. It's symbol as a provider of protection extended to ancient Rome where the soldiers wore tiger eye stones for safety during battle.
The brightly polished, oval-shaped design abandons the more common beaded bracelet and offers a more temporary feel.