Yes, but this gold (gold bars, gold necklaces, etc.) should be deposited in the bank, which means that the deposit certificate issued by the bank proves that this gold is yours, which proves that this wealth is yours from the side.

if you wear jewelry on your hand, it won't be much use. To apply for a credit card, the bank looks at your financial resources and economic ability (to put it bluntly, whether you have money or not).