Belgian researchers have found a way to determine the origin of a diamond, a breakthrough that could help fight the illegal sale of precious stones from war zones.
Researchers from the University of Ghent and Belgium's Diamond High Council were able to figure out the chemical "fingerprint" of a diamond after making a tiny hole in it with a laser beam.
The print helps them identify the mine from which it came because each precious stone has a chemical composition specific to an individual mine.
Rebel groups in such countries as Sierra Leone, Angola and the Democratic Republic of Congo have used so-called blood diamonds to finance wars. About 70 countries that produce diamonds have agreed to curb the trade and have a Thursday deadline to meet monitoring requirements or face a trading ban.