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A: Shikon no Tama (or the Jewel of Four Souls) is a sacred jewel which grants power to whoever holds it. The jewel was created by a powerful priestess called Midoriko, during her battle with a great demon. Midoriko was able to seize the souls of yōkai and purify them, leading to the creation of the jewel. The substance used to make the jewel is unknown though. The jewel is of pale pink color. Quartz is often mistaken for the Shikon no Tama.