Tide jewels

In Japanese mythology, the tide jewels-- individually, the kanju (干珠^?, lit. "(tide-)ebbing jewel") and manju (満珠^?, lit. "(tide-)flowing jewel")-- were magical gems that the Sea God used to control the tides. Classical Japanese history texts record an ancient myth that the ocean kami Watatsumi 海神 "sea god" or Ryūjin 龍神 "dragon god" presented the kanju and manju to his demigod son-in-law Hoori, and a later legend that Empress Jingū used the tide jewels to conquer Korea. Tide jewels interrelate Japanese dragons and wani sea-monsters, Indonesian mythology, the nyoi-ju 如意珠 "cintamani; wish-fulfilling jewel" in Japanese Buddhism, magic jewels of Nāga kings in Hindu mythology, and the pearl associations of Chinese dragons in Chinese mythology.