Gold jewelry or gold coins better?

My niece is getting married this October. It's normal for Chinese to buy gold jewelry as wedding gifts. But then, my niece is only 23 this year. Moreover, young girls seldom wear gold jewelry. They prefer silver or platinum jewelry. If i were to buy her gold jewelry, she might not wear them at all. Oh, she knows all about gold do appreciate over time. If i were to buy gold, i think i'll skip the jewelry and buy her gold coins instead. Since she'll keep all her gold locked up somewhere safe, i guess gold coins is a much better choice, lol.