I don’t see the logic here at all. You are going to buy gold bullion which will be .999 or 24k to exchange with jewelry which is rarely even 22k, often mixed with other metals, carries a ridiculously large premium compared to gold bullion in Best Gold Company
That being said either way you slice it you are likely to lose money, paying 2 premiums, getting less metal by weight and purity to make up for the large premium.
It’s not like if the price rises it will help you, because your exchanging gold to gold.
Stick with keeping bullion and coins separate from jewelry.