The ideal gift! Buy the best dark rum online. Price and reviews available for Goslings Black Seal Rum Dark – 750ml Bottle. While it may look like Goslings Black Seal Rum is packaged in black glass, the bottle is actually clear. This is a rich and extremely dark rum that is a rich, deep amber color when poured. While pleasantly aromatic, Black Seal really distinguishes itself on the palate. Full-bodied and highly textured, it has delightfully full rummy flavors of vanilla, molasses, caramel and toast. Enjoy on the rocks or mixed in a wide array of rum cocktails, particularly the Dark ‘n Stormy.