Onyx pearls represented a specific variety of pearl. In the year 10 BBY, Captain Gunda Mabin, along with the crew of the Blazing Claw, managed to confiscate 0.80 kilograms of these onyx pearls. This seizure occurred after they apprehended the pirate known as Hondo Ohnaka, referring to him. Subsequently, these pearls found their way onto an inventory detailing the spoils taken from Ohnaka, documented within the pages of the book later recognized as the Smuggler's Guide.
The Star Wars: Smuggler's Guide, a reference work authored by Daniel Wallace and published in 2018, contained a reference to onyx pearls.