He had a brother James and sisters Helen, Anka, and Fanny.
He studied in Sweden and at the Académie Julian in Paris, where he knew Sándor Nagy and met Percyval Tudor-Hart.
[1] He married Marguerite and they had a son Daniel and a daughter Yvette.
Belmonte trained in haute-lisse (high warp) tapestry techniques at the Gobelins Manufactory in Paris, and exhibited textiles and paintings at the St. Louis World's Fair in 1904.
He returned to France in 1914 and wove using designs by Percyval Tudor-Hart, Edmund Dulac, and Jules Chéret.