That is an interesting legal theory... I doubt it will work though.
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If you are both living in NY, then probably NY law will apply. Was it an engagement ring or a Christmas present?
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Probably. The proposal need not be in New York if the substantive content of the agreement is based on a future in New York. Even if the offer and acceptance were in Aruba, the mutual consideration paid and/or suffered by the parties was most likely in New York.
Also, if by chance you signed a prenuptial agreement, review its provisions re: termination of engagement.