Full description on the ring episode of portia
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The ring is a symbol of Portia's love and commitment, and if Bassanio doesn't keep it on his finger, he's in big trouble. Bassanio says he's fine with this and promises that "when this ring / Parts from this finger, then parts life from hence''. No surprise here—couples have been exchanging rings for centuries.
Yet this ring also seems to symbolize much more. In "Portia's Ring: Unruly Women and Structures of Exchange in The Merchant of Venice," literary critic Karen Newman notes that, at first, the ring seems to represent Portia's submission to her soon-to-be husband and her willingness to become subservient when she marries.
Yet when Portia gives Bassanio the ring (and all of her worldly possessions and property), she also puts herself in a position of power, because she's giving her soon-to-be husband more than he can possibly give her in return