How does Gold ETFs Mutual Funds work?

Gold ETFs are supported by physical gold as back-end and also provides a guarantee about the purity of gold. For Gold ETFs, NSE allows an authorized participant or members who are generally the large companies, to handle the purchase and sale of gold to generate ETFs. One can but directly Gold ETF from NSE/BSE which will be equal 1 gm of gold, investing in Gold ETF mutual fund can make this requirement bit small, as one can invest as much as the amount is required, Authorised Participants can invest 1000 units by collecting this fund.