The references to "Kings and Queens" and the "diamonds" are all vague metaphors dealing with playing cards.
The "Black, Black Heart" referred to goes along with these vague metaphors, as most hearts on cards are red. The heart here is the opposite though. They've become black, the color of clubs and spades.
Don't ask me what all these card metaphors mean though, I haven't the slightest.
The references to "Kings and Queens" and the "diamonds" are all vague metaphors dealing with playing cards.
The "Black, Black Heart" referred to goes along with these vague metaphors, as most hearts on cards are red. The heart here is the opposite though. They've become black, the color of clubs and spades.
Don't ask me what all these card metaphors mean though, I haven't the slightest.