He obtained his license as a lawyer in 1879 and registered as an advocate at the bar of Corte in the Bastia Court of Appeal.

[2] During the 1902 legislative elections out of loyalty to the Republican party he declined to oppose the incumbent deputy for Corte, Marius Giacobbi.

Instead he ran as Republican candidate on 27 April 1902 in Sartène and was elected by 5,955 votes against 748 to the runner-up Jean-Paul Susini, a nationalist.

[2] In 1909 Gabrielli ran in a senatorial by-election to replace two Corsian senators, Arthur Ranc and Emmanuel Arène, who had died.

He often intervened in debates, particularly concerning the budget, advocating forest roads and railways from Ghisonaccia to Bonifacio, the Castelluccio penitentiary in Ajaccio, sanitation on the east coast and military service.

He was also interested in issues related to the sea in general, was a member of the navy committee and discussed subjects such as the law of towing, the naval code of justice and sale of land on litoral islands.

[2] Gabrielli resigned on 8 November 1920 ahead of the January 1921 renewal to accept a position as judge in the civil court of the Seine department.