When James Delaney visits his newly bought and formerly Spanish ship in Taboo S01E02, he finds something between the floor planks that looks like gems or coloured stones:
Once he realizes that the ship actually is a former slave ship, he gets rather frantic, scratching and gathering those stones out from the planks, accompanied by flashbacks to his experiences during the sinking of the Influence.
But what are these and why were they scattered between the floor planks of the ship? If they were actual valuable gems, how did they get there and how did noone else take them yet? And is this related to its nature as a slave ship somehow? Or is this as much a mystery to Delaney and everyone else as it is to me? Furthermore, and related to this, how does this scene fit into the rest of the narrative? Is it, or the gems, ever taken up again or was this just a character moment for Delaney to be reminded of his past experiences with slave ships?