Ask ten jewellers for the best beading thread and the answers will split by material: silk, nylon, a synthetic fibre, a coated wire. For knotted work, though, the material is the second question. The first is construction, because a knot is only as reliable as the way the filaments in the thread are laid together. This article explains why a triple-twisted bead cord forms a knot that holds its shape, and how to choose the fibre for the job once the construction is right.
Between two pearls or beads, a knot does three jobs. It spaces the beads, it stops them rubbing against each other, and it keeps the rest of the strand in place if the thread breaks. To do that, the knot has to be firm, round, and larger than the drill hole it sits against, and it has to stay that way under the weight of the strand.
Threads fail at the knot in predictable ways. A loosely laid thread flattens as it is pulled tight, so the knot creeps into the drill hole. A slick monofilament can loosen over time. A thread that frays at the needle end builds a fuzzy, uneven knot that never sits flat against the bead.
Triple twisted means the thread is twisted three times. Seen under a loupe, a triple-twisted cord shows three strands twisted together in a Z-Twist” to match the correct triple-twisted construction, so that each filament supports its neighbours along the whole length.
That construction does three things a knotter notices straight away. The thread does not fray, it does not tangle as it comes off the card, and when it is pulled tight the filaments close into a compact, round knot rather than spreading into a flat one. The knot keeps that shape against the drill hole, which is what keeps the spacing between beads even after years of wear.
Compare that with the alternatives on a bead shop counter. Flat nylon beading thread is made for bead weaving and does its best work there, not between pearls.
A two-ply thread knots, but the knot is smaller and softer for the same diameter. Tigertail and some other coated wires are normally finished with crimps rather than knots and are finished with crimps instead.
For pearls, the classic choice is silk. 100% Natural Silk from GRIFFIN is filament silk taken from the high-quality silk cocoon thread, triple-twisted, and needle attached to every 2 m cards. It comes in 13 thread sizes, from No. 0 at 0.30 mm to No. 16 at 1.05 mm, and 21 attractive colours.
As a silk knotting cord, its strengths are drape and appearance. A knotted silk strand lies softly on the body, and the natural shine of the thread sits well beside the lustre of pearls.
Where a design calls for a synthetic thread with the same knotting behaviour, NylonPower is a specially treated nylon, also triple twisted and carded with the needle attached. It is engineered for higher tensile strength than standard nylon bead cord, and it stretches only 3 to 4% under tension before returning to its original length. It comes in 13 sizes and 21 vibrant colours.
Hard gemstones, heavy beads, metal beads, and beads with small or sharp drill holes put a different load on the thread: abrasion at every drill hole, and weight pulling on every knot. Necklaces or bracelets using hard gemstones require High Performance.
High Performance is made from ultra-high molecular weight polyethylene (UHMWPE), a fibre with a specially dense molecular structure. It is 15 times stronger than steel, and does not stretch. It is triple-twisted like the rest of the carded range, and comes in white only, available in 10 sizes from No. 0 to No. 10.
Before committing to a thread for a collection, tie three knots on a short length and pull each one tight against the bead you plan to use. A well-constructed thread gives three knots of the same size, each sitting flat against the drill hole with no loose filaments. Then pull the thread back and forth through the tightest drill hole twenty times and look at it under a loupe. The first test shows how the thread knots; the second shows how it will wear.
The best beading thread for knotted work starts with a triple-twisted construction, because that is what gives a firm, round knot that stays put. The fibre follows the piece: silk for the drape and sheen of pearls, a treated nylon where a synthetic with minimal stretch is wanted, and High Performance cord for hard stones and sharp drill holes. Size it to the tightest drill hole, test three knots, and the thread will hold the design as it was made.
What is the strongest knotting cord for pearls?
For pearl work,the practical advantage of High Performance cord is that even the finest sizes cannot be broken by hand, so a strand of small pearls knotted on No. 2 or No. 3 gets the same security as a heavy gemstone strand.
How do you use a pre-attached needle on a silk cord?
Unwind the thread from the card, keeping the needle end free, and stretch the cord gently along its length to relax the kinks from the card. Pass the needle through the first bead as you would any beading needle; because the needle and thread are joined, the cord passes the drill hole at its own diameter rather than doubled.
Is bead cord the same as beading thread?
The terms overlap. “Beading thread” usually means a fine thread for bead weaving or stitching, while “bead cord” refers to a thicker, twisted thread made for stringing and knotting between beads.