Differences in Gold etf fund


I am confused while looking at different valuation of gold etf funds at nse website. For Eg: click on below link and you will find there is significant difference in the prices of different gold etf.


As I understood all this etf invest in gold then why there is so much difference in the prices?

Also, if I want to invest in gold etf which etf I should choose and what is the criteria for selection?

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