I like a good grey but I can't tell any difference between RBL Concrete Jungle and Diamond Cosmetics Concrete Jungle. None. Both were two coats. Both are a lovely pale shade of blue based grey. Both are a creme. Both have the same name. Well, there is one difference. One is $18 and the other is under $3. I did get some bubbles with RBL and I have no idea why.
I really, really cannot tell them apart. Honest. You may think one is darker but that is shadowing because in real life not one difference in color.
I have to declare Diamond Cosmetics the winner. The formula is just as nice, I didn't get any bubbles and it's way, way cheaper.