The diamond knot (or knife lanyard knot) is a knot for forming a decorative loop on the end of a cord such as on a lanyard.
The diamond knot is "tied alike" the Chinese button knot, "but they are worked differently."
The diamond knot begins as a Carrick bend with the ends exiting diagonally opposite each other. When the steps below are completed the knot is rearranged and tightened so that the ends emerge from the knot parallel and opposite their own standing part. A Chinese button knot is often tied in a very similar manner, but without leaving a loop at the end.
Knife lanyard knot, Sailor's knife lanyard knot, Marlinspike lanyard knot, Single-strand diamond knot, Two-strand diamond knot, Bosun's whistle knot, Friendship knot