Knot guide · decorative
The lanyard knot (diamond knot)
The lanyard knot — also called the diamond knot or knife lanyard knot — is the sailor's finishing touch: a compact, decorative stopper that turns the end of any cord into a rigid, attractive loop. Tied at the end of a woven lanyard, it creates the loop that clips to a knife, whistle or light. Tied in the middle of a cord, it locks two working ends in place for a two-colour fob. It is the knot that makes craft pieces look finished.
What you are actually tying
Strip away the mystique and the diamond knot is a wall-and-crown combination: you form a wall (a row of loops pushed down), then re-thread the working end back through the structure following its own shadow, so the cord traps itself. Because the strand retraces an existing path, the knot stays put under load and unties only when you deliberately pick the loops loose.
Tying it, step by step
Form the base loop
Make a simple overhand loop in the cord, left over right, leaving a 10 cm working end. Pin the crossing point — this becomes the knot's foot.
Build the wall
Push a bight of the working end down through the loop from above, then pass the end behind the standing part and across the front, forming three parallel bights pointing down. You should see a "crown" of three loops around a central neck.
Re-thread the shadow
Now the move that makes the knot: take the working end and follow its own path back through the structure — up alongside the first bight, over the crown, down the channel where it originally lay. Keep the strand parallel to itself, no crossings, and leave everything slack.
Dress and shape before tightening
Hold the knot loosely and even out the three loops so each is the same size; the diamond pattern should already be visible. Then work the slack out loop by loop — never by hauling both ends. Finish by rolling the knot between finger and thumb until it is firm and spherical.
The three classic mistakes
- Tightening too early. Once a diamond knot seizes, its symmetry is frozen — including the flaws. Shape first, tension second.
- Crossing the shadow. The re-thread must parallel the original path. If the working end crosses another strand on the way back, you get a lumpy, asymmetric cousin of the knot.
- Uneven bights. Three loops of three different sizes make a lopsided diamond. Check symmetry from the front and the side before rolling tight.
Field note: nylon paracord holds the diamond beautifully because its sheath grips itself. The same knot in slick cord (polyester, dyneema) needs an extra half-turn of dressing or it will work loose. For slippery lines, back the knot up with a melted splice hidden inside.
Where the lanyard knot earns its keep
End of a knife lanyard (its original job), crown of a monkey fist keychain, centre of a two-colour fob, sliding adjuster on a camp lantern hanger — anywhere a loop must stay open under a swinging load. Pair it with a prusik loop on a ridgeline and you have an adjustable hanging point without metal. Practise on stiff cord before attempting it in the field: this is a muscle-memory knot, not a diagram knot.
The knot's lineage is a sailor's tour: it appears in old marlinspike manuals as the knife lanyard knot, tied at the chest end of the lanyard that kept a jack-knife attached to its owner through storms and boardings. The name "diamond" describes the four-way crown visible from the top once the knot is worked tight — in two colours, the faces alternate like a checkerboard, which is why it also closes box knot chains and finishes woven lanyards so handsomely.