By Kevin Gray MIAMI (Reuters) – One of America's most iconic homes, the Miami Beach mansion that once belonged to Italian fashion designer Gianni Versace, goes on the auction block on Tuesday, with bidding set to open at $25 million. The 1930s-era Mediterranean-style estate, which has 10 bedrooms, 11 bathrooms and a pool inlaid with 24-karat gold, is being sold as part of a bankruptcy proceeding by its current owner, telecom magnate Peter Loftin. …