To determine which individual was not a judge of the Supreme Court of India, let's review each option:
- Justice R. Banumathi: She served as a judge of the Supreme Court of India.
- Justice Gyan Sudha Mishra: She also served as a judge of the Supreme Court of India.
- Justice Manjula Chellur: While she had a distinguished career in the judiciary, including serving as the Chief Justice in multiple High Courts, she was not a judge of the Supreme Court of India.
- Justice Ranjana Prakash Desai: She served as a judge of the Supreme Court of India.
Thus, the individual who was not a judge of the Supreme Court of India is Justice Manjula Chellur.