Dear Priya,
Because of his unauthorized absence, if he falls short of completing 5 years of continuous service, which means during each year of his stint, he should have put in 240 days of uninterrupted continuous service as defined in the Act, then in principle, he is not eligible for gratuity. However, you need to share his attendance particulars during the entire period of 5 years' service or more if any, to advise you accurately.
Regards,
Vinayak Nagarkar
HR Consultant