Saigon Jewelry Company gold bar plunged 0.92% to VND118.9 million (US$4,584.54) per tael. A tael equals 37.5 grams or 1.2 ounces.
Gold ring declined 1.30% to VND114 million per tael.
Gold price has risen 41% since the beginning of the year.
Globally gold prices hit an over one-month low on Thursday ahead of a key U.S. data, which is expected to provide cues on the Federal Reserve's monetary policy path, while a thaw in U.S.-China trade tensions also weighed on bullion's appeal, Reuters reported.
Spot gold fell 0.8% to $3,153.09 an ounce, after hitting its lowest level since April 10, earlier in the session.
The U.S. and China agreed to reduce tariffs drastically and adopted a 90-day pause, de-escalating a potentially damaging trade war between the world's two largest economies. However, global markets still remained uncertain about the outcome after 90-days.
U.S.-China trade truce is good news to the market, so people are looking at risky assets more now, said Brian Lan, managing director at GoldSilver Central, Singapore.
"We are looking at the $3,150 as the next key level. If that doesn't hold, then $3,100 is likely."