Mattson, Linda. History of the Village of Otter Lake, Lapeer County, Michigan. CMU Term Paper, 1971. Metamora Among the Hills: A History. Metamora Township, MI: Metamora Friends of the Library, 1979. Porter, Floyd W. The Triumphs of His Grace; A Pilgrimage of More than 140 Years by the People of God, Called Methodist at Lapeer, Michigan.
The Cullinan, which was found near Pretoria more than a century ago, was until recently acknowledged to be the largest cut diamond in the world, weighing in at 530.20 carats. In 1985 it lost the record to the Golden Jubilee, which was found in the same mine as the Cullinan and weighed 545.67 carats.
The diamond that takes first place is the Sergio. This rock was found in Brazil in 1895 and weighs 3,150 carats (about 1.4 pounds) making it the largest uncut diamond in the world. The Sergio is even more interesting because of its color, a rare black. Black diamonds like the Sergio are believed to have their origins in meteorites. Cullinan