I agree with the above as to the engagement ring. It is a conditional gift. Marriage satisfied the condition. You cannot be forced to return the engagement ring. Probably same is true as to wedding ring. As for other gifts during the marriage, generally they are completed upon delivery, HOWEVER, there may have been agreements/strings that attached at the time of the gift which could make that analysis less clear. As advised, it is best to consult an attorney where a full factual history can be taken and analyzed to provide a more performable response.