A growing equity mortgage (GEM) is a full term home loan with an interest rate usually comparable to prevailing rates, in which payments increase yearly with the additional payments going towards principal reduction.
The interest rate can sometimes be fully indexed, which means that indices would influence the amount of interest charged. It can also be a fixed rate mortgage.
The result of such loan structures is that a borrower would be able to fully repay the mortgage in a shorter period compared to the normal amortization schedule.