If you have not yet worked with this color, Black Diamond, you should try them. I wasn't sure how they would "shine" but they are just right when black jet is too much color for your piece that you are creating. It's neutrality blends very nicely with almost everything.
Tried 2 "Greys"
I bought both greige and black diamond to compare which would be best for my project. I had never seen actual samples before. The black diamond was beautiful and that's what I chose to use. They both are very nice.
I really like this color. It goes great with burgandy and black. I also have these in 3 mm and 5 mm because I use them so much.