This unique necklace represents the pomegranate, a traditional Jewish fruit. The pomegranate is one of the seven fruits that represents the Land of Israel. It is also said that a pomegranate has 613 seeds, corresponding to the 613 Mitzvot.
This is a meaningful Bat Mitzvah present for a young girl just taking on the responsibility of those Mitzvot.
For a wide selection of pomegranate necklaces, click the Amazon link.