If you are considering a black duvet set for your bedroom, you should first consider how bright the room is. Black absorbs light, and you may find the room darker once you add black bedding. The solution can be as simple as an extra lamp, or brighter light bulbs, but you may also want to consider dark grey as an alternative color for your bed sheets, pillow cases and duvet cover.
Black duvet sets:
Black duvet sets example. Pictured: Divatex Home Fashions Royal Opulence Woven Satin Stripe Duvet Mini Set, black. Available in full/queen, king and twin.
Also of interest: 4 Pieces Soft Reversible Satin Solid Black Duvet Cover , Fitted Sheet, and Pillowcase Set for Queen Bed by Chezmoi Collection / Divatex Home Fashions Royal Opulence Woven Satin Stripe Sheet Set / Egyptian Cotton 300 Thread Count Solid Duvet Cover Set by Luxor Treasures