Ten'genseki (Tibetan Agate) is a type of agate with white, black, gray, or brown stripes. It has a unique pattern that looks like an eyeball when the multiple stripes overlap and are polished into a round shape. In Tibet, it was discovered on the surface of the earth, not underground, and was said to be a "stone that fell from the sky," and has been used as a ritual implement and amulet since ancient times. Meaning and effects as a power stone: Due to its eyeball-like pattern, it is said to have the power to ward off evil. It is also said to enhance insight and give the ability to discern the truth. Material...Natural stone Color...Gray Bracelet/Bangle...Bracelet Stone Material...Other