The phrase "black glitter" refers to something that appears dark and shiny at the same time, usually creating a mysterious or enchanting effect. Full definition
I really need a pair of black glitter jeans, these are so cute! (style-splash.com)
So Elegant (one coat over What's Your Point - settia) is a glitter topper with gunmetal hexagonal glitter with fine black glitter in a clear base. (heyaprill.com)
Esky Flvr Eclipse Hat in black with black glitter writing in with either Apocelipse or Eclipse writing. (sqnsport.com)