Diamond heart) is a 1975 Indian Tamil-language action thriller film[1] written, directed and produced by C. V. Sridhar.

The film stars Sivaji Ganesan, Padmapriya, R. Muthuraman and K. Balaji.

[2] The film was titled Hero 72,[3][4] with Sridhar opting to make it a Tamil-Hindi bilingual, with Jeetendra starring in the Hindi version that was later titled Gehri Chaal.

Production on the Tamil version that was later titled Vaira Nenjam progressed slowly because of call sheet issues of Ganesan; Gehri Chaal was completed and released much earlier.

[8][9] Kanthan of Kalki said the film, despite its title, was not lustrous like a real diamond.