When you work with cotton, you need good scissors! These sturdy Le Suh scissors are perfect for cutting cotton cord to just the right length without using a lot of force. 
 
old fashioned German quality
stainless steel
suitable for left handed people too
20 cm in length
 
Not all scissors are suitable for working with cord, wool or fabric. These beauties are especially made for that and will stay sharp for a long time. Trust me, I've tested them! 
You can also find these scissors in my macramé starter pack.