Diamond Necklace (2012)
Diamond Necklace is a 2012 Malayalam film directed by Lal Jose, starring Fahadh Faasil, Samvrutha Sunil, Gauthami Nair and Anusree in the lead roles. Gauthami Nair and Fahadh Faasil won Filmfare awards for their roles. Composer Vidyasagar won a Filmfare award too.
More at Wikipedia.