A big-hearted, cancer-stricken Long Island jeweler has been jailed in Iran for the alleged crime of visiting Israel 13 years ago — leaving his increasingly desperate family pleading for his release.

Kamran Hekmati, 70, a dual US and Iranian citizen, was rounded up by the saber-rattling regime in the spring, during one of his many travels back to his beloved home country, his cousin Shohreh Nowfar told The Post.

Iranian officials eventually sent Hekmati to the notoriously brutal Evin Prison as punishment for his Israel trip, during which he had attended his son’s bar mitzvah.

The ongoing Kafka-by-way-of-Tehran nightmare prompted Hekmati’s family and Rep. Tom Suozzi (D-Long Island) to push Secretary of State Marco Rubio for help.

“He just wants to come home,” Nowfar said. “Anytime he t

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