DIAMANTINO. – A prelature in the state of Mato Grosso in Brazil, suffragane of Cuiabá. It was erected by Pope Pius XI on 22 March 1929 by the apostolic constitution *Cura Universa*; the boundaries then assigned were later modified by a decree of the Sacred Consistorial Congregation on 22 June 1940. The prelature church is that of the Immaculate Conception, located in Diamantino. It is entrusted to the Company of Jesus.
Bibl.: AAS, 23 (1931), pp. 320–22; 32 (1940), pp. 42–43. Enrico Joni