Gosling Black Seal rum is the flagship brand for the Gosling Family and near synonymous with Bermuda rum being in production since 1860. Black Seal rum is a blend of rums produced in pot stills and continuous column stills, which Gosling believes imparts a balance of flavor and elegance. Black seal rum was sold only out of the barrel up until World War I. British navy brought empty champagne bottles for a fill up out of the rum barrel, which were re-sealed with black wax; hence, "black seal" rum.

The Gosling Family dates their founding to 1806 when James Gosling--Englishman and merchant--bound for America ended up landing in Bermuda. Scorning further sea adventures, he opened up his shop in St. George, Bermuda. The company moved from James Gosling, to brother Ambrose, to Ambrose's sons, who began distilling their rum in 1860. The company is still family-owned to this day. They call themselves "the spirit of Bermuda." Castle Brands is the exclusive distributor for the rums the Gosling Family produces.