In 1922, after the Asia Minor catastrophe, Diamantis came to Athens.

Very early on he showed a particular interest in art, and in 1929 published his cartoons in the Journal of Pediatric Diaplasis. In 1930, upon the recommendation and encouragement of Ph. Giofylli, he exhibited his work in the "Atelier". In 1931, he exhibited at the "Art Asylum" of Belgium. From 1931 to 1936, he studied in Fine Arts, with teachers D. Biskini and K. Parthenis. In 1934, still a student in Fine Arts, he created sets and costumes for the Alcestis of Euripides, who uploaded K.Koun in People's Theatre. During this time, he took trips to Italy and France, where, without systematically attending classes, he came into contact with modern pur...