The complete guide to Assam's 3 silks — Muga, Eri & Pat explained | Heritagene

There is a question every silk buyer in India eventually asks, and almost no one answers well: what actually makes Assam silk different?

Not different in the way marketing copy says everything is different. Different in the way that matters when you're spending ₹8,000 on a saree — different in fibre, in origin, in what happens to the fabric fifty years from now.

Assam produces three entirely distinct silks: Muga, Eri, and Pat. They come from three different silkworms, fed on three different plants, reared in three different ways, and they produce three fabrics with almost nothing in common except the state they come from. Choosing the wrong one for the wrong occasion is genuinely easy to do — and choosing the right one, for the right reasons, is one of the most satisfying decisions a fabric buyer can make.

This is that guide.

Why Assam is unlike anywhere else in the world

Before the three silks, the context: Assam is the only place on earth that produces all four major varieties of silk — Muga, Eri, Pat (mulberry), and oak Tasar — in a single region. No other state, and no other country, has this. The knowledge of sericulture is believed to have spread from Assam to the rest of India, not the other way around. References to Assam's silk appear in Kautilya's Arthashastra and in the travel records of the Chinese scholar Huen Tsang. The Ahom rulers, who governed Assam for six centuries (1228–1826 AD), decreed that their senior officials could only wear Muga silk. Royal looms — called Rajaghoria looms — operated under direct royal supervision.

This isn't heritage as nostalgia. It's context that explains why an Assamese Muga Mekhela Chador costs what it costs, and why it is worth every rupee.

Muga silk — the golden silk the world cannot replicate

What it is

Muga silk is produced by the Antheraea assamensis silkworm — a semi-wild species found only in Assam. The worm feeds exclusively on som (Machilus bombycina) and soalu (Litsaea polyantha) leaves, trees that grow naturally in the Brahmaputra valley. You cannot rear Muga silkworms anywhere else in the world and produce the same silk. The combination of silkworm species, host trees, and Assam's specific climate is irreplaceable. This is why Muga silk received a Geographical Indication (GI) tag in 2007 — a form of protection that makes it illegal for any silk not produced in Assam by this worm to be called Muga.

What makes it extraordinary

The thread is naturally golden — not dyed, not treated. That warm, amber-gold colour is inherent to the fibre itself, produced by carotenoid pigments in the silkworm's diet. And unlike almost every other fabric in existence, Muga silk becomes more lustrous with every wash. The sheen deepens over years. A Muga Mekhela Chador passed down through three generations looks richer than a newly made one. Assamese women treat their Muga garments as heirlooms — comparable, in family significance, to gold jewellery.

Muga is also the second most expensive silk in the world, after Pashmina. To produce 500 grams of raw Muga silk, approximately 2,500 silkworms are needed. An average saree (6–8 sq. metres) requires around 1,000 cocoons.

What Muga is used for

• Muga Mekhela Chador — the traditional two-piece Assamese dress worn at weddings, Bihu, and ceremonial occasions
• Muga sarees — worn for formal and festive occasions across India
• Stoles and dupattas — the golden sheen works with both traditional and contemporary outfits
• Home furnishings — cushion covers, table runners, and wall hangings that age beautifully

Who should buy Muga

Buy Muga if you want a fabric that gets better with time, carries formal cultural weight, and will genuinely be worn — and treasured — by the person who receives it. It is the right choice for weddings, milestone gifts, and anyone who understands that ₹15,000 spent on a Muga saree is not the same as ₹15,000 spent on anything else.

Before you buy: Genuine Muga silk will be off-white to golden in colour naturally — never brightly dyed. Look for the GI tag and, where possible, Sualkuchi Silk Testing Laboratory certification. Heritagene's Muga products carry verified GI authentication.

Eri silk — the fabric of peace, and the future of sustainable fashion

What it is

Eri silk is produced by Samia cynthia ricini, a silkworm that feeds on castor plant (Ricinus communis) leaves. The name "Eri" itself derives from the Assamese word Era, meaning castor. Among the Bodo people of Assam, it is called Indi, and among global sustainable fashion communities, it is increasingly known by another name:

Ahimsa silk — peace silk.

Here is why: in conventional silk production, silkworms are boiled alive inside their cocoons to preserve the long continuous thread. Eri silk is different. The silkworm naturally emerges from the cocoon before the silk is harvested, leaving a broken thread that is spun rather than reeled. The silkworm lives. No creature is killed in the making of Eri fabric. This makes Eri the only silk that can honestly be called cruelty-free.

What makes it remarkable

The spun (rather than reeled) thread gives Eri a texture unlike any other silk — softer, warmer, and more matte, closer in hand-feel to a fine wool or linen. It has excellent thermal properties: warm in winter, breathable in summer. It is highly durable, moisture-absorbent, and takes natural dye exceptionally well.

Eri silk received its own GI tag in 2024, specifically for Bodo Eri silk from the Bodoland region of Assam, recognising the distinct production traditions of the Bodo community. Assam produces approximately 65% of India's total Eri silk.

What Eri is used for

• Eri shawls — the most popular form, warm enough for Assam's winters and fine enough for gifting
• Eri sarees and Mekhela Chadors — softer and more casual in drape than Muga, suitable for everyday formal wear
• Jackets and stoles — the wool-like texture makes it perfect for layering
• Sustainable fashion labels — Eri is increasingly used by designers building conscious collections

Who should buy Eri

Buy Eri if you care about ethical production, want a silk with warmth and texture, or are looking for a gift that tells a genuinely meaningful story. Eri is also the right choice for everyday formal wear — it's more forgiving than Muga, less precious, and easier to style with modern silhouettes. With India's sustainable fashion movement growing rapidly in 2026, Eri silk is positioned exactly at the intersection of conscious buying and genuine craft tradition.

A note for gifters: Eri shawls are one of the most universally appreciated gifts in Northeast India — they work across genders, ages, and occasions, and carry the full weight of Assam's silk heritage without the price point of Muga.

Pat silk — the brilliant white, the everyday formal

What it is

Pat silk (also called Nuni or Mulberry silk) is produced by Bombyx textor, a domesticated silkworm that feeds exclusively on mulberry (Morus) leaves. Unlike Muga and Eri — both non-mulberry, indigenous to Assam — Pat silk shares its silkworm species with China, Japan, Korea, and most of the world's conventional silk production. What makes Assamese Pat silk distinct is the local weaving tradition it has been embedded in for centuries.

What makes it distinctive

Pat silk is brilliant white to off-white in colour, with a bright, high sheen and fine, smooth texture. It is fully reeled (not spun), producing a long continuous thread that allows for very fine, intricate weaving. Sualkuchi — Assam's silk capital, often called the Manchester of the East — is the primary centre for Pat silk weaving, and the patterns woven on Pat silk Mekhela Chadors are among the most technically complex in Indian handloom tradition.

The domesticated silkworm means faster production (approximately 35 days per cycle) and lower cost than Muga, making Pat silk the most accessible of Assam's three silks.

What Pat is used for

• Pat Mekhela Chadors — the most commonly worn silk dress at Bihu celebrations and formal occasions
• Pat sarees — formal but lighter in investment than Muga
• Festive wear — the bright white takes colour well when bordered with traditional woven motifs

Who should buy Pat

Buy Pat if you want Assamese weaving tradition at a more accessible price point, or if you're buying for someone who wears their silk regularly rather than reserving it for rare occasions. Pat silk also pairs beautifully with Muga — many traditional Mekhela Chadors are woven combining both — giving you the golden Muga lustre at the border with the bright Pat body.

Side-by-side: which silk should you choose?

How to spot genuine Assam silk before you buy

The most important thing to know: all three Assam silks are regularly faked or blended without disclosure. Muga in particular — being the most expensive — is frequently mixed with Pat or even synthetic fibre and sold as pure.

Here is what to check:

1. The burn test — genuine silk burns slowly, smells like burning hair, and leaves a crushable ash. Synthetic fibre melts, drips, and smells of plastic. Muga silk specifically will have a warm golden colour in the ash.

2. The feel — Muga feels slightly stiff and substantial; Eri feels soft and warm; Pat feels smooth and cool. All three feel notably different from synthetic "silk."

3. GI certification — for Muga, ask for the Sualkuchi Silk Testing Laboratory certification. It shows the type of silk tested and whether it is pure.

4. The price — a "pure Muga Mekhela Chador" for ₹2,000 is not Muga. Genuine Muga starts at ₹6,000–₹8,000 for smaller pieces and goes significantly higher for fine sarees.

5. The source — buy from sellers who can name the weaver community, the silk type, and the origin. Heritagene works directly with artisan communities in Assam and provides full provenance for every silk product.

The people behind Assam's silk

It is easy to think of silk as a fabric. It is harder — and more important — to think of it as the livelihood of approximately 4 lakh families in Assam whose income depends on sericulture and weaving. Weaving in Assam is traditionally women's work: almost every rural household in the Brahmaputra valley has a loom. The women who produce Assam's silk are not factory workers — they are skilled artisans practising a craft that has been documented for over 2,000 years.

When you buy a piece of genuine Assam silk — particularly from a source that pays artisans fairly — you are not buying fabric. You are sustaining a knowledge system that no institution, no government programme, and no technology can replace if the human chain breaks.

What to buy from Heritagene

Every silk piece in our collection is:

• Produced by named artisan communities in Assam
• Authenticated for silk type (Muga, Eri, or Pat)
• Fairly compensated to the weavers who made it
• Packed with the full story of its making

→ Explore our Muga silk collection → Shop Eri silk shawls and sarees → Browse all Assam silk

Questions about which silk is right for you? Write to us at info@heritagene.com — we'll match you to the right piece for your occasion, budget, and the person you're buying for.