Just a tip buy it over there from a gold shop in the area where they live and get a receipt from the shop. Normal gift is a 1 chi ring for a wedding or cash in an envelope. Usually gold is given by close Family members and friends who are in the wedding party. If your just bowling up for the food 500000 vnd in an envelope will be fine. Traditionally the 1 chi ring is used as cash if needed at some point so a receipt from the shop is a must. Most gold shops engrave the makers shop name inside. 1 chi 3.75 grms about 150 USD. You can buy 96, 98,999 18k, 22k,24k. enjoy .