Engagement rings are considered conditional gifts. The condition is marriage. If you did get married, then it is yours, as your own property and you should have no problem keeping it.
In some situations, courts have construed the ring to be such a big asset, that it was an "investment" and then it would be marital property
. This is a rare occasion, but worth knowing, if the ring is so expensive that it is a good part of your marital estate.
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