Hypothèse de provenance pour une broche avec deux diamants gris de type IIb

This note was originally written and published in The Journal of Gemmology, 39(4), pp. 316–318 under the title “About the history of a brooch with two rare grey type IIb diamonds”, as a complement to an article by the team from the Laboratoire Français de Gemmologie published in issue 39(3) of the same journal. We are publishing its French version here with the kind permission of its editor-in-chief, Mr. Brendan Laurs.