A Brief History of the Marque
Manufactured: 1907-1954 by Gentil et Cie
75ter rue de Viliers
Models using Diamant engines were named thus, but there were also machines from 1905 listed in a catalogue for Societe La Francais, but with the brand of simply Diamant.
Before and after the 2nd World War they built BMA machines. The company was absorbed by the Gentil group, after which their output was very similar to Labor, Alcyon and Armor lightweight models.
Sources: jlbweb.fr, vieilleschainesvillefranchoises.e-monsite.com