Vienna Girardi's stepmom tells us Vienna gave the ring back to Jake when she moved out of his place this weekend -- but TMZ has learned Jake won't get to keep the $50,000 diamond for himself.
Vienna's stepmom tells us when Vienna moved out of Jake's place this weekend -- she left a goodbye note ... and the 3 carat Neil Lane diamond ring that he used to pop the question on "The Bachelor."
But sources close to the show tell us Jake is required to give the ring back to the production company. The deal is -- they only get to keep the ring if they get married.
Playing the percentages ... the show usually wins.
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