Eighteen karat red gold may be made of 25% copper and 75% gold. For 18 karat rose gold, typically about 4% silver is added to 75% gold and 21% copper to give a rose color. 14 karat red gold is often found in the Middle East and contains 41.67% copper.
Redwood Falls is a city in Redwood County in the U.S. state of Minnesota. The population was 5,254 at the 2010 census. It is the county seat.
According to the United States Census Bureau, the city has a total area of 5.38 square miles (13.93 km 2); 5.25 square miles (13.60 km 2) is land and 0.13 square miles (0.34 km 2) is water. The Redwood River flows through the city near its mouth at the Minnesota River. Redwood Falls is located along U.S. Highway 71. Other main highways in the city include Minnesota State Highways 19 and 67.