The Shikon Jewel, also known as the Sacred Jewel or Jewel of Four Souls, is a powerful marble-sized jewel which grants whoever possesses it with immense power. Shikon, is formed from the Japanese words, 'shi' meaning four, and 'kon' meaning soul. 四 (in Chinese writing system (ancestoral to Japanese) means four (shi). 魂 (in Chinese writing system (as well as Japanese) means soul (kon). 玉 (in Chinese and Japanese) Jade or royal stone (tama). Making the Shikon no Tama. Near the end of the series, it is revealed that the Shikon Jewel is the true antagonist, manipulating Naraku and the group into preserving its existence.