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GIVER-WORST

The filthy-rich financier fighting his ex-fiancée to get back a $400,000 ring is a “Native American giver.”

So says Raoul Felder, the lawyer for multimillionaire Gerald Tsai’s former sweetie, Sharon Bush.

Tsai “doesn’t get it. He doesn’t know what Valentine’s Day is all about,” Felder said.

Tsai is suing Bush – ex-sister-in-law of President Bush – for the return of the 11.07-carat canary yellow diamond ring he gave her two Christmases ago.

Felder said Tsai, 78, gave the ring to Sharon, 55, as a Christmas present, not an engagement gift.

Felder also took aim at the timing of Tsai’s suit, filed Monday, days before the romantic holiday.

“Valentine’s Day is a day you give gifts to your sweetheart. It’s not the day you demand Christmas presents back,” Felder said,

“He’s a Native American giver,” Felder said of Tsai.

He said his client plans to keep the bauble, which the suit values at $434,000.

“We will vigorously defend this case. The ring is hers,” he said, adding that it’s currently hidden away in a vault in Bush’s home state of Texas.

Tsai’s lawyer declined comment.

A Bush pal said the pair got engaged on Thanksgiving 2006, although Tsai’s suit says he popped the question and she accepted that October.

The pal said Tsai gave her the ring as a no-strings-attached gift that Christmas, and they had planned to wed at the moneyman’s waterfront estate in Rye last Valentine’s Day.

The plans got tripped up when Tsai refused his fiancée’s request to sign a prenup guaranteeing her financial security if anything happened to him.

Sharon Bush – who had been enmeshed in an ugly and scandalous split from Dubya’s brother Neil – could have sought half Tsai’s fortune after his death, but wanted the prenup to avoid court fights with the four-time-married Tsai’s exes and their kids.

“She just wanted to protect herself,” the pal said, noting that Sharon’s 23-year marriage to Bush ended with her getting a little more than $2,000 a month in alimony and almost losing her home.

“She didn’t want to be put in that position again,” the pal said.

Tsai kept pressing her to move in with him or get married, but Sharon resisted, the pal said – and the tycoon didn’t like not getting what he wanted.

“He’s an angry, rejected man who’s probably not used to having people say no,” the pal said.

dareh.gregorian@nypost.com