What is KPSI and why does it matter?

KPSI stands for knots per square inch — the number of individual hand-tied knots packed into each square inch of the rug's surface. Higher KPSI means finer design detail, more labour, and almost always greater value. The finest Qom silk pieces reach 800–1,000+ KPSI. Standard decorative silk rugs are typically 100–200 KPSI.

Which silk rugs are most valuable?

Fine Qom (Qum) silk from Iran, particularly pieces with 500+ KPSI; antique Hereke silk from Turkey (Ottoman palace quality); early 20th-century Kashan silk; and antique Chinese silk with gold thread. Among these, Qom silk and antique Hereke consistently command the highest prices at auction and with specialist buyers.

How do I tell if my rug is genuine silk?

The burn test is definitive: pull a few fibres from an inconspicuous edge and burn them. Real silk burns slowly, smells like burnt hair, and produces a crushable ash. Synthetic fibres (viscose/art silk) melt, smell of plastic, and form a hard bead. Silk also feels cool to the touch and changes sheen when viewed from different angles.

Does condition affect silk rug value?

Condition matters but is less decisive for silk rugs than for wool rugs, because silk's durability means even old pieces often retain pile integrity. A damaged silk rug from a prestigious origin (Qom, Hereke) can still be worth significant amounts. Professional restoration of silk rugs is possible and can substantially improve value.

Is mercerised cotton the same as silk?

No — mercerised cotton is a treatment that gives cotton a silk-like sheen. It is commonly used to produce cheaper 'art silk' rugs that can look similar to genuine silk but are worth a fraction of the price. The burn test distinguishes them reliably: mercerised cotton burns like paper and smells of burning cotton, leaving grey ash.

How do I sell my silk rug?

Submit three photographs to a specialist silk rug buyer: full front in natural light, full back, and a close-up of the pile detail. A specialist will identify the weaving centre, assess KPSI, and make a genuine purchase offer within 48 hours. Avoid general auction houses and clearance dealers, who rarely have the expertise to correctly value silk rugs.

Expert Guide · 8 min read

How Much Is a Silk Rug Worth? Complete Value Guide

Q: How much is a silk rug worth?

Silk rugs range from £100 for small modern decorative pieces to £100,000+ for exceptional antique Qom or Hereke examples. The most important factors are origin (Qom and Hereke command the highest prices), knot density (KPSI), age, and condition. A room-size Qom silk in good condition typically sells for £5,000–£40,000.

Silk rugs occupy the very top of the rug market — and the very bottom of it. Understanding what separates a £100 decorative piece from a £100,000 collector's item requires knowing four things: where it was made, how finely it was knotted, when it was woven, and what it's made of. This guide covers all four.

Key Takeaway

Origin and KPSI (knots per square inch) are the two biggest drivers of silk rug value. A fine Qom silk with 600 KPSI can be worth 50× more than a decorative silk rug of the same size. Always get a specialist assessment before assuming what yours is worth.

What Makes a Silk Rug Valuable?

Four factors determine a silk rug's value, and they interact with each other in ways that make specialist knowledge essential:

1. Origin (Weaving Centre)

Where a silk rug was woven is the single most important value factor. Some weaving centres have centuries-long traditions of producing extremely fine silk work; others produce decorative-grade silk at industrial scale.

Highest-value origins: Qom (Qum), Iran — the world's most prestigious silk rug centre. Turkish Hereke — Ottoman palace-quality silk. Early 20th-century Kashan and Isfahan silk from Iran.

Mid-value origins: Tabriz and Nain silk (Iran), antique Chinese silk, Kashmir silk from India.

Lower-value origins: Modern Indian, Pakistani, and Chinese decorative silk rugs sold in retail chains. These use genuine silk but lack the artistic and technical quality of specialist workshop pieces.

2. KPSI — Knot Density

KPSI (knots per square inch) measures how finely a rug was knotted. Silk's thin fibre allows far higher KPSI than wool — the finest Qom pieces reach 800–1,200 KPSI, versus 100–300 KPSI for the finest wool rugs. Higher KPSI means:

Greater design precision — intricate curvilinear patterns become possible
More labour per square metre — and correspondingly higher value
Finer pile height — giving a more lustrous, jewel-like appearance

Typical KPSI Ranges by Silk Rug Type

3. Age

Age affects silk rug value differently from wool rugs. Because silk is more durable, antique silk pieces (pre-1940) often retain excellent pile condition even at 100+ years old. Antique pieces from Qom, Hereke, and Kashan in good condition command strong premiums — but a modern Qom silk at peak KPSI can still be worth more than an old but low-quality piece.

4. What It's Actually Made Of

Not all "silk" rugs are equal. Three materials are used and often confused:

Genuine silk pile: Highest value. Can be identified by the burn test (smells of burnt hair, crushable ash).
Silk foundation, wool pile: Common in very fine Persian rugs. Valuable — the silk foundation allows higher KPSI. But the pile is wool, which affects value differently from pure silk.
Mercerised cotton / "art silk": Cotton treated to resemble silk. Burns differently (grey ash, smells of paper). Worth a fraction of genuine silk.

Silk Rug Value by Type

The table below gives typical sale ranges for room-size pieces in good condition. Individual pieces vary significantly with design, KPSI, and specific condition.

Type	Typical Range	Exceptional Examples
Qom (Qum) Fine Silk — 500+ KPSI	£8,000–£40,000	£100,000+
Qom Silk — Standard 200–500 KPSI	£2,000–£12,000	£30,000+
Hereke Silk — Antique (pre-1940)	£5,000–£30,000	£80,000+
Hereke Silk — Metal Thread	£8,000–£50,000	£120,000+
Kashan Silk — Pre-1940	£3,000–£20,000	£50,000+
Isfahan / Tabriz Silk	£2,000–£15,000	£40,000+
Chinese Silk — Antique	£1,000–£12,000	£40,000+
Indian / Kashmir Silk	£500–£5,000	£15,000+
Decorative Silk — Modern	£100–£1,000	£2,500+

Room-size pieces in good condition. Values vary with KPSI, design, specific age, and market demand. Only a specialist assessment determines an accurate figure.

How to Tell If Your Silk Rug Is Valuable

Step 1: The Burn Test

Pull 3–4 fibres from an inconspicuous edge and burn them with a lighter. Genuine silk: burns slowly, smells of burnt hair, leaves crushable dark ash. Synthetic fibres (viscose, polyester): melt rather than burn, smell of plastic, form a hard bead. Mercerised cotton: burns like paper, smells of burning cotton, grey ash.

Step 2: Count the Knots

On the back of the rug, count the knots in a 1-inch square. If you can see 200+ distinct knots per square inch, you have a fine rug. 500+ indicates a genuinely exceptional piece. This is best done with a magnifying glass in good light.

Step 3: Look at the Back

The pattern should be mirrored in exact detail on the reverse. The finer the KPSI, the crisper the pattern on the back. Any labels, woven inscriptions, or cartouches on the reverse can help identify the weaving centre.

Step 4: Check the Sheen

Real silk changes sheen dramatically as you view it from different angles — it appears to lighten and darken as you move around it. Art silk has a more uniform, flat sheen. High-quality silk also feels cool and smooth to the touch.

Common Mistake

Many silk rug owners assume their rug is decorative-grade based on where they bought it or what they paid, without realising the original retail price has little relationship to specialist collector value. A Qom silk rug bought from a Persian rug shop 30 years ago for £2,000 may now be worth £15,000+ to the right buyer.

Where to Sell a Silk Rug

The right selling route depends on the piece's value tier:

Specialist Buyers (Recommended for Most)

For genuine silk rugs — particularly from Qom, Hereke, or Kashan — specialist buyers offer the fastest route to a genuine market price. A specialist can identify the weaving centre, count KPSI, and make an offer within 48 hours based on photographs alone. No transport, no fees, no commission.

Specialist Auction Houses

For exceptional pieces (£20,000+), major auction houses with dedicated rug departments (Bonhams, Sotheby's, Christie's) can achieve strong hammer prices. However, buyer's premium (25–30%), seller's commission (10–15%), and waiting time (3–6 months for the right sale) reduce net proceeds significantly.

General Dealers and Clearance Companies

Avoid these for genuine silk rugs. General dealers rarely have the expertise to correctly identify or value a fine silk piece. The same rug that gets a £500 offer from a clearance company can be worth £15,000 to a specialist buyer.

Frequently Asked Questions

How much is a Qom silk rug worth?

Qom (Qum) silk rugs typically sell for £2,000–£40,000 for standard to fine pieces in room size, with exceptional examples at 600+ KPSI reaching £100,000+. KPSI is the key differentiator within Qom silk — submit photographs for an accurate assessment.

Is my silk rug worth more than I think?

Very possibly — particularly if you purchased it from a specialist retailer or inherited it. Decorative-grade silk rugs have minimal collector value, but fine Qom or Hereke pieces can be worth far more than their retail price, especially if they are 20+ years old and the silk rug market has strengthened since purchase.

Can a damaged silk rug still be valuable?

Yes. Silk is durable and fine pieces from prestigious origins retain significant value even with damage. Professional restoration of silk rugs is well-established. Always get a specialist assessment before assuming a damaged silk rug has no market.

How do I sell a silk rug quickly?

Submit three photographs to a specialist silk rug buyer. We respond with an expert assessment and purchase offer within 48 hours. From first contact to payment typically takes under one week — far faster than auction, with no fees or commission.

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