NY Mets owner Steve Cohen's wife is showing out for her hubby's baseball team in a big way ... Alex Cohen just copped an insane, iced-out, 14-karat white gold chain with 30 carats of diamonds, and we're told it's worth $65,000!
TMZ Sports has learned Alexandra -- who married Cohen in 1992 -- commissioned the piece after she recently ran into celeb jeweler Will Selby at Citi Field while he was delivering a chain to an NBA star.
"I was dropping off a piece for Donovan Mitchell and bumped into her at the owner's suite at The Mets game," Selby told us, "and the rest has been history.