1. In India, an individual's selling of gold jewellery/coins/biscuits/bars/bullion will be treated as a capital gain. If an NRI earns any profit from the sale of these assets, then while filing his Income Tax Return in India, tax has to be paid.
Even if you sell gold received from your parents as a gift, there will be capital gain in your hands, and you will be liable to pay taxes.
2. No need to report any purchase of the above-mentioned capital assets. But the sale of these assets has to be reported in the ITR under the head capital gain.
If you purchase gold of more than Rs. 2 Lakhs, then you have to submit your PAN with the vendor as mandatory compliance on the part of the vendor.
3. Cash sale exceeding Rs. 2 Lacs is prohibited from promoting the digital economy. It is advisable to make all your purchases and sales using banking channels.
4. When you carry gold jewellery from the US to India, there is a specified limit. For Men - 20gms up to a maximum of Rs. 50,000 and for females - 4 gms up to a maximum of Rs. 1,00,000. However, this qty will also depend upon various other factors like the person's stay in the US etc.
When you carry gold from India to the Us - there is no such limit and no customs duty to be paid on it in India at the time of leaving for the Us. But it's better to get an export certificate from the customs regarding the quantity of jewellery being taken out so that you do not face any problem when taking the jewellery back to India.
5. Even if a person has lost the purchase receipts, he will still be liable to pay capital gain. You can take the valuation of the registered valuer in this regard to assist you in calculating capital gain.