And I have found Demetrius, like a jewel,
Mine own, and not mine own.
-- William Shakespeare (1564–1616), British dramatist, poet. Helena, in A Midsummer Night’s Dream, act 4, sc. 1, l. 191-2.
She has “found” him by chance or magic, and so, like a jewel found by accident, he may be claimed by someone else.