Ever worn a necklace made of tagua seeds? Stores like Mujus make one-of-a-kind colorful necklaces out of this rare fruit that comes from the Amazon rainforest. The seeds become very hard, almost like ivory, after being harvested and aged. They'll even make custom jewelry if a friend or relative has a preference for certain colors, shapes, or arrangements. The pieces can also be green in more ways than one as the fruit is only gathered up after falling naturally from the trees.