A Sa Huynh period earring was discovered in an excavation in Binh Thuan Province. The article says that the earring is made of glass, but from the pictures it looks like nephrite to me.
Ancient earring unearthed in Binh Thuan
Viet Nam News, 02 July 2011
The museum of central province of Binh Thuan on Thursday unearthed a 2,500 year-old earring, the first of its kind ever to be found in the province, according to museum official.
Nguyen Xuan Ly, museum director, told Viet Nam News that, although thousands of ceramic antiques from Sa Huynh Culture have been unearthed throughout the area, this was the first time such an earring has been found in the province.
Similar earrings have been discovered in other central provinces such as Quang Nam and Quang Ngai.