FeatureGems & Gemology, Summer 1994, Vol. 30, No. 2

越南北部红宝石和彩色蓝宝石开采的最新情况 (英语)

Robert C. Kammerling, Alice Keller(爱丽丝·凯勒, Kenneth V. Scarratt, Saverio Repetto

Northern Vietnam began producing significant quantities of rubies and fancy sapphires in the late 1980s. Since then, mining has evolved at the two major producing areas: Luc Yen and Quy Chau. Heavy machinery is now used in both of these remote areas, but small-scale manual mining is ongoing. Efforts continue to establish organized cutting and distribution centers.