"How to Tie a Decorative Diamond Knot: Tying It All Together" explains how to tie a decorative diamond knot. The diamond knot is a decorative cylindrical knot, which is also known as the lanyard knot and the knife lanyard knot. Make a loop with one end of the string, and fold the other end parallel in the center of the loop. Feed the end of the right string over the left string and pull down. Fold the right string over and feed through the left side of the loop. Pull a second loop behind the parallel line in the loop and pull the end completely out of the top. Flip the knot over and feed both ends of the string through the center of the loop. Tighten both loose ends of the string as necessary to finish the knot.