Most if not all companies selling and buying gold online are not permissible. When they sell your gold, they don’t give it to you on the spot and likewise when you buy.

This is a form of Riba as both transactions should be done simultaneously.

Is it permissible to buy and sell gold online?

Riba | March 2, 2014 5:12 am
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In our country the secular banks give out calender, dairy and other things to its customer as complementary gift during new year. Is it permissible to use these stuff received from riba based banks.