A large and very rare pink diamond has been found in the African country of Angola.The pink diamond weighs 170 carats.A carat is a weight measurement used only with some valuable minerals.It is equal to 200 milligrams.The diamond is said to be one of the largest gemstones found in 300 years.The gem even has a name.It is called “Lulo Rose.”The mine owner, Lucapa Diamond Company, said on their website that it was found in the Lulo alluvial diamond mine.Alluvial mines are near or in riverbeds.The chief of Lucapa, Stephan Wetherall, told the Associated Press, “Only one in 10,000 diamonds is colored pink.So, you’re certainly looking at a very rare article when you find a very large pink diamond.”