I am enclosing the excerpt of the relevant section for your information:
Compulsory Insurance
(1) With effect from such date as may be notified by the appropriate Government in this behalf, every employer, other than an employer or an establishment belonging to, or under the control of, the Central Government or a State Government, shall, subject to the provisions of sub-section (2), obtain insurance in the manner prescribed for his liability for payment towards the gratuity under this Act, from the Life Insurance Corporation of India established under the Life Insurance Corporation of India Act, 1956 (31 of 1956).