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In order to mediate the relationship between the opposite sex, it brings all fates together favorably and mediates that relationship. Since it only brings things together favorably, large differences can be seen in its effects depending on the individual.
Hence, if the Witch giving this item does not measure with care whether the target she will give it will be able to use this item effectively or not, it's likely that she will be called a liar. The initial cost is enormous, and to many human beings, it's no more useful than a mere brooch.
However, blind love will easily pay this enormous cost. The more good will there is from the other partner, the more dramatic the effects will become. Ironically, the more dramatic the effects are, the original need of such a brooch lessens.