Gold ETF, Why 1 unit is equal to 68.What this 1 unit represents

Hello, I am trying to understand gold ETF and want to invest some amount every month in gold ETF. But I am not very clear with the meaning of 1 unit. Somewhere I read that 1 unit is 1 gram. But 1 gm 22 carat gold is around 7400 rs But 1 unit ETF is 68 rs I mostly invest in mutual fund so need some help around this topic Thank you for reading