What is silk on silk and why does it cost so much

If you have spent any time looking at handmade carpets seriously, you will have come across the term silk on silk. It appears on the most expensive pieces in any collection and is often offered as an explanation for why certain carpets cost what they do. But the phrase itself tells you very little unless you know what it actually means and why the construction matters.

Most handmade carpets are woven with a wool pile on a cotton or wool foundation. The foundation is the structural base of the carpet, the warp and weft threads that hold everything together. The pile is the visible surface, the part you walk on and look at. In a standard carpet these two elements are made from different materials, and neither of them is silk.

In a silk on silk carpet, both the foundation and the pile are pure silk. Every thread in the carpet, structural and decorative, is silk. This changes almost everything about how the carpet is made, how long it takes, and what the finished piece can do.

Why silk changes the knot count

The single most important consequence of using silk is that the threads are far finer than wool. A silk thread can be as little as a quarter of the diameter of a comparable wool thread. Because the threads are finer, the weaver can pack significantly more knots into the same area of carpet. Where a fine wool carpet might achieve 200 to 400 knots per square inch, a silk on silk carpet can reach 800, 1,200 or even 1,800 knots per square inch. The record pieces from the great Persian workshops go higher still.

More knots per square inch means more detail is possible. Curves become genuinely curved rather than stepped. Petals in a floral design can be rendered with individual shading. Faces in pictorial carpets can carry real expression. The level of visual resolution in a high knot count silk carpet is closer to a painting or an engraving than to a textile.

This resolution is not just decorative. It is the primary reason collectors value these pieces so highly. A carpet with 1,800 knots per square inch represents a density of human labour and technical skill that has no equivalent in any other handmade object at a comparable price point.

Where the finest silk carpets come from

The two cities most associated with silk on silk carpet production are Qum in Iran and Hereke in Turkey. Both have traditions that developed in the twentieth century, relatively recently by carpet standards, and both produce pieces that are now collected worldwide.

Qum, south of Tehran, works almost exclusively in silk. The city developed its carpet tradition in the 1930s and 1940s, drawing on the classical Persian design vocabulary of Isfahan and Kashan but executing it at knot densities those cities never attempted. Qum silk carpets are recognisable by their fine detail, their luminous colour and their relatively modest sizes. Most are between two and six feet in width. Larger pieces exist but are considerably rarer and more expensive.

Hereke, near Istanbul, produces what many consider the finest silk carpets in the world. The Hereke imperial workshops were established in the nineteenth century to produce carpets for the Ottoman court, and the tradition of exceptional quality has never left. Hereke silk carpets are signed by their makers, knotted at extraordinary densities, and made in very small quantities. A single Hereke piece can take years to complete.

Kashmir also produces silk carpets of high quality, and is the source of many of the silk on silk pieces that appear in the Singapore market. Kashmiri weavers work in the same Persian design tradition and achieve knot counts that rival Iranian production at a somewhat lower price point.

Why the price is what it is

Raw silk is significantly more expensive than wool. A kilogram of weaving-grade silk costs many times more than an equivalent weight of high-quality carpet wool. In a large silk carpet, the material cost alone is considerable before a single knot has been tied.

But the material cost is secondary to the labour cost. A weaver working in wool on a standard carpet can tie several thousand knots in a day. A weaver working in silk at high density ties far fewer, because the threads are finer, the precision required is greater, and the physical effort of maintaining that precision over hours is exhausting. A carpet with 1,000 knots per square inch measuring six feet by nine feet contains roughly eight million individual knots. At a realistic production rate for fine silk work, that carpet represents several years of a skilled weaver's working life.

The weavers who produce the finest silk carpets are specialists. The skill required to maintain consistent tension and density in silk at high knot counts takes years to develop. There are relatively few people in the world who can do it well, and the number is not growing.

How silk behaves differently to wool

Beyond the construction and the cost, silk carpets have a physical character that wool cannot replicate. Silk reflects light. When you move around a silk carpet, or when the light in the room changes, the pile shifts in tone. From one angle it appears luminous and saturated. From another it deepens. This effect, called the play of silk, is one of the defining pleasures of owning a piece.

It also means that silk carpets are sensitive to light in a way that wool is not. Direct sunlight will fade silk pile over time. The best place for a silk carpet is a room with indirect or controlled light, away from windows that receive strong afternoon sun. This is worth knowing before you place one.

Silk carpets are also more delicate underfoot than wool. A fine silk on silk piece is not designed for a hallway or a room with heavy foot traffic. It belongs in a formal sitting room, a study, or displayed under a glass table where it can be seen without being walked on constantly. Some collectors hang them on walls entirely, treating them as textiles rather than floor coverings. That is not precious. For the finest pieces, it is genuinely sensible.

What to look for when buying

The first thing to check is whether the carpet is actually silk. Synthetic fibres, particularly viscose and art silk, can look similar to genuine silk in photographs and even in person to an untrained eye. The simplest test is to pull a few pile fibres from an inconspicuous corner and burn them. Genuine silk smells of burning hair and leaves a crushable ash. Synthetic fibres melt, smell of burning plastic, and leave a hard bead.

The second thing to assess is the knot count. A genuine high-quality silk on silk piece will have a knot count that is verifiable by inspection. Turn the carpet over and look at the back. In a well-made silk carpet the knots are visible and regular. You can count them per linear inch in both directions and multiply to get the knots per square inch. A piece claimed to be 1,000 KPSI that shows 20 knots per linear inch on the back is not 1,000 KPSI.

The third consideration is the design and execution. Silk on silk carpets are expensive enough that the design should be worthy of the construction. The best pieces are drawn from the classical Persian and Ottoman repertoire, executed with precision and dyed with colours that are balanced and considered. A high knot count in a poor design is still a poor carpet.

If you are considering a silk carpet, the pieces in our collection have all been inspected and the provenance, knot count and material can all be discussed. That conversation is worth having before you commit to a piece at this level. Browse our silk carpet collection or get in touch to speak with us directly.