six
Diamond Rio was created in 1984.
Your answer depends on the diamond mine you reference. Most diamond mines are owned by different companies. For example, in Canada, from their Wikipedia page: "The mine is owned by a joint venture between the Rio Tinto and Dominion Diamond Corporation, and is operated by Diavik Diamond Mines Inc., a subsidiary of Rio Tinto Group." In Australia, the Argyle Mine is owned by the Rio Tinto Group. In Russia, the Udachnaya pipe is owned by Alrosa. In Africa, The (Botswana) Orapa diamond mine is owned by Debswana.
Diamond Rio - album - was created on 1991-05-28.
Imagine That - Diamond Rio song - was created on 1997-11-03.
The Reason - Diamond Rio album - was created on 2009-09-22.
I Believe - Diamond Rio song - was created on 2002-11-18.
Yes, yes there is.
Yes, alot
Rio Group was created in 1986.
Country
Close to the Edge - Diamond Rio album - was created on 1992-10-27.
The population of Rio Tinto Group is 2,011.