The primary condition to receive gratuity is that an employee should be in service continuously for five (5) years. This condition is relaxed in the case of termination due to death or disablement. In these cases, no minimum period of service is required. 

Payment of Gratuity Act, 1972

Section: 2A
Continuous service.

For the purposes of this Act, -

(1) an employee shall be said to be in continuous service for a period if he has, for that period, been in uninterrupted service, including service which may be interrupted on account of sickness, accident, leave, absence from duty without leave (not being absence in respect of which an order [***] treating the absence as break in service has been passed in accordance with the standing order, rules or regulations governing the employees of the establishment), lay off, strike or a lock-out or cessation of work not due to any fault of the employee, whether such uninterrupted or interrupted service was rendered before or after the commencement of this Act.

Thanks Mr. Kumar. So this means even if an employee is on LOP / LWP but on rolls of the company is eligible to claim the Gratuity and can take count of LOP / LWP period as continuity in service. Please confirm.

It is felt that approved leave shall be counted, and the leave you have cited has not been updated as a break in service by an order of the establishment.

Section: 2A
Continuous service.

For the purposes of this Act, -

(1)

"absence from duty without leave (not being absence in respect of which an order [***] treating the absence as break in service has been passed in accordance with the standing order, rules or regulations governing the employees of the establishment),"

Valuable advice of learned experts/members is sought.