Back in the other world, Selah Spencer was given the jade necklace when she was only a baby.
Since it had made contact with her, it had recognized her as its owner.
Before that, it may have been passed down to generations of the Chang family but it was only an ordinary necklace to them that has sentimental value since it served as their family heirloom.
However, when Juliette Chang became pregnant, her parents John Chang and Alayna Griffin reminded her of the jade necklace that was given to her when she was also just a baby.
It was time for her to pass it down to her first daughter just as they passed it down to her.
John Chang was overjoyed then to have a daughter since he didn't have any sisters of his own and his parents couldn't pass down the necklace.
The jade necklace had remained with John's parents until he married and finally had a daughter, Juliette.
John's parents then directly handed down the jade necklace to her.