Seems I've met my match

When each child is born they are given a charm. Each male born child will get a ring and each female child will get a necklace. The appropriate item will have a stone in it. It shall remain green until you find your souls mate. Then, it shall turn red, telling you that this is the person you are meant to be with...

17 year old Katelyn has been living a good life. She's not unpopular, and she's not popular, not best friends with everyone, but has few enemies. She's happy with her life. Until a certain blue eyed man walks into her advanced English class, making her necklace burn her skin and turn red.....