If the initial sum is from a Non Resident Ordinary (NRO) account, in that case investment can also be made on non-repatriation basis.

Dividend / gains and also principal amount can be repatriated even if the original investment is made on non-repatriation basis. 

Under the liberalized scheme, NRIs can repatriate / remit abroad an amount of US$ 1mn per financial year out of the balances held in NRO account.

If required, such balance can also be transferred from NRO account to NRE account held with any bank in India