Guinea Fowl eggs

Does anybody know what colour guinea fowl eggs are?     We have 2 guinea fowl in with our hens; we've recently been getting small brown (with a pinkness about them) eggs, they are also very smooth.   Now, amongst the hens there are 4 Light Sussex hens who have only just started laying so there's every chance the small eggs are theirs.   

Thanks for your help 

To my eyes they are smaller than hens eggs and more pointy.  Try cracking one, the shells are really hard. 
 No sign of mine laying at all.