Nicolas Cage tossed Lisa Marie Presley's $65k engagement ring into the sea, according to claims made by Priscilla Presley in her new bombshell memoir.

RadarOnline.com can reveal Elvis's widow has heavily documented her daughter's fiery relationship with the Con Air star, which lasted four years beginning in 2000.

And one of their "epic fights" resulted in Lisa Marie's expensive ring being lost forever. Article continues below advertisement

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Priscilla wrote: "One afternoon, they went sailing off the coast of Catalina Island on Nick's yacht, the Weston."

She said that "something set off another of their epic fights, and Lisa pulled off her engagement ring and threw i

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