A new technique using lasers could be employed to identify so-called conflict gemstones, identifying their country of origin, U.S. researchers say...The process could eventually allow companies buying gems to make sure their purchases aren't helping finance bloodshed or civil war in the countries where the gems originate, scientists said. "With enough data, we could identify which country, which mining region, even the individual mine a mineral comes from," Catherine McManus, director of research at Materialytics Inc., which developed the technique, said.