Diamond Ratnababu is a notable Indian filmmaker and screenwriter known for his contributions to Telugu cinema. He began his career as a writer, making his debut with the action film Sher (2015), and later penned scripts for movies like Luck Unnodu (2017) and Gayatri (2018), a crime drama starring Shriya Saran and directed by R. R. Madan. His writing style often blends commercial elements with socially relevant themes, laying the groundwork for his transition into directing.

Ratnababu made his directorial debut with Burra Katha (2019), starring Aadi Saikumar. The film explored the concept of dual personalities and was noted for its unique premise, though it received mixed reviews. His most ambitious project to date is Son of India (2022), featuring veteran actor Mohan Babu in the lead role. The film centers around Kadiyam Babji, also known as Virupaksha, who kidnaps individuals from various professions, prompting an intelligence officer (played by Pragya Jaiswal) to investigate. Despite its patriotic theme and star-studded cast, the film garnered mixed-to-negative reviews from critics and audiences.

Diamond Ratnababu is known for his bold storytelling and willingness to experiment with genre. He has expressed interest in directing a crime thriller starring Malayalam superstar Mohanlal and actress Manchu Lakshmi, signaling his intent to expand his creative reach across industries.

Beyond filmmaking, Ratnababu is recognized for his close professional relationships with industry veterans like Mohan Babu and Chiranjeevi. His journey from screenwriting to directing reflects a commitment to cinematic storytelling and a desire to push boundaries within mainstream Telugu cinema.