Long ago, there was a prophecy told by the ancients to the four Lords of Feudal Japan. Four baby girls would be born to defeat a great evil that would take over the lands. The girls would each be given one of the four legendary birthstones when they came of age. Emerald would be given to the one who had a pure heart that no one could ever taint. She would be given the power to control all four elements: Air, Earth, Water and Fire. This would make her the leader and heart of the Gem Guardians. Ruby would be given to the one whose heart was fragile, but whose strength in spirit gave her the will of a warrior. She would be given control over Fire. She would be the soul of the Gem Guardians. Topaz would be given to the one who was the freest. Spirited and beautiful at heart, she would be given the power over the element of Air, naming her the most free spirited of them all. The final stone, Sapphire, would be given to the one who was as free and adventures as the sea. She would be given the power of Water, making her the most adventures of all the Gem Guardians. It's said that the four girls would be born at the same exact time, each born to one of the four Lords and Ladies of the corners of Japan.
But the prophecy was long forgotten by all, until the time of the predestined day. The four girls were born. As they cried for the first time, the prophecy was spoken once again by the ancients. As each baby came into the world, crying out for their mother, there was a glow coming from the body of each mother. A burst of light came out of each woman's body. The hearts took the shape of the legendary birthstones, leaving the Ladies lifeless, gone forever, mothers to the four baby girls they would never be able to hold. All four Gems floated a moment before landing in the hands of the four sons of the Western demon leader, Lord Inutashio. The Emerald went to the youngest son, Inuyasha, and to the oldest, Sesshoumaru, went the Sapphire. Ruby went to his adoptive son, Miroku; Topaz traveled to the hand of Kouga, his another adopted son. The ancients spoke something new. The girls would need to be sent to the future to live a safer life until the time came for them to return and defeat the evil. Then they would claim their thrones beside the men the Gems had chosen.
The ancients took the girls from their fathers and bought them to the Boneeater's Well. They placed each baby beside each other and started chanting a spell. A glow started surrounding each baby and after the glow disappeared, they were gone too, send to the future to live a safer life until the girls could come back home. The sons would be sent to look for their soul mates in the future and bring them back safe. It was their jobs as protectors' to the girls soon to become the Gem Warriors and Guardians of Feudal Japan. They had time, but when destiny called them, they would become Gem Warriors and the Guardians of Japan.