Phra Chinnarat Bai Sema is a Buddhist amulet that depicts the Phraphutta Chinnarat Buddha image (fig.) from Wat Phra Sri Rattanamahathat Wora Maha Wihaan, which is seated in the half lotus position on a lotus pedestal and in front of a structure called crystal palace, or reuan kaew in Thai (fig.), which has a shape reminiscent of stone boundary markers, that are known in Thai as bai sema (fig.), hence the name of the amulet.