Gemstones in Vietnam — Pala international
Gemstones in Vietnam. A review. Pham Van Long 1, Gaston Giuliani 2, ie Garnier 3, Daniel Ohnenstetter 3. 1 Center for Gem and Gold Research and Identification, Hanoi, Vietnam 2 IRD and CRPG/CNRS, BP 20, 54501 Vandœuvre, France 3 CRPG/CNRS, UPR 2300, BP .