Diamond Suppliers in Kolkata
Wholesale Natural & Lab Grown Loose Diamonds for Jewellery Manufacturers and Retailers Across Kolkata
Mann Gems LLP is a certified diamond supplier in Kolkata, trading natural and lab grown diamonds for jewellery manufacturers, wholesalers, and retailers across the city. Kolkata has run on Bowbazar and Burrabazar for generations, but neither market cuts or grows its own stones, which means every serious jeweller here depends on a supplier who can move certified stock in fast and reliably. That’s the gap we fill. Every diamond we send carries GIA or IGI certification, backed by 15+ years of trading experience, across natural diamonds, lab grown diamonds, and all eleven commercially traded shapes.
WHOLESALE DIAMOND SUPPLIER IN KOLKATA
Diamond Suppliers in Kolkata: Natural & Lab Grown Diamonds for Local Jewellers
We’re Mann Gems LLP, a certified diamond supplier in Kolkata working with jewellers, manufacturers, and wholesalers across the city’s trading belts. We supply loose natural diamonds and lab grown diamonds, in all eleven shapes, from melee to solitaire sizes. Kolkata’s jewellery trade runs on Bowbazar’s narrow lanes and Burrabazar’s wholesale halls, both built for gold and finished pieces rather than raw diamond sourcing, so most jewellers here end up buying stock second or third hand through resellers. We cut that chain down to one step: certified stone, priced against the day’s market, sent straight to your shop or workshop.
Every quote we give on wholesale diamonds in Kolkata is checked against current market rates, and every certified diamond is graded under GIA or IGI before it ships. Tell us the carat range, shape mix, and certification tier you need and we’ll work from there. We also supply retailers and manufacturers further out across West Bengal, Bihar, Jharkhand, Odisha, and the Northeast, since Kolkata is where a lot of that regional trade routes through anyway.
THE KOLKATA JEWELLERY TRADE
Why Kolkata Jewellers Need a Direct Diamond Supplier
Kolkata’s jewellery trade centres on Bowbazar, a stretch of narrow lanes in central Kolkata that has run gold, diamond, silver, and gemstone trading for generations, and Burrabazar, one of the city’s oldest and largest wholesale markets. Both are genuine trading hubs, but neither is a cutting or manufacturing centre the way Surat is, and neither has a diamond bourse the way Mumbai does. That means diamonds reaching Bowbazar and Burrabazar have usually already passed through two or three hands by the time a local jeweller sees them, with a markup added at every step.
Kolkata also sits as the trading gateway for a wider region: West Bengal, Bihar, Jharkhand, Odisha, and parts of the Northeast all route a share of their jewellery sourcing through the city. A direct, certified supplier based outside the usual reseller chain saves cost for a Bowbazar jeweller and for a retailer sourcing from further out alike.
Diamond Quality Standards
Every stone we supply, natural or lab grown, is checked against the 4Cs before it goes out to a Kolkata buyer:
- Cut: how well the diamond handles light, which has the biggest effect on how it actually looks once set.
- Color: the range from colorless through faint yellow, with colorless stones commanding the higher price.
- Clarity: what’s visible inside and on the surface of the stone; fewer inclusions means a rarer, more valuable diamond.
- Carat: the raw weight of the stone, where price increases faster than weight as size goes up.
We also check finish and symmetry on every parcel before it ships, so what a Kolkata jeweller receives matches what was confirmed at the time of order.
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What We Supply: Natural & Lab Grown Diamonds
We supply both natural diamonds and lab grown diamonds to jewellery manufacturers, wholesalers, and retailers across Kolkata, each one independently certified before it leaves our office. Here’s what’s available:
Natural Diamonds: Earth Mined Stones for Bowbazar's Bridal Trade
Natural diamonds take billions of years to form underground, and every stone we sell is graded on cut, color, clarity, and carat before it’s certified. Bengali bridal jewellery still leans heavily on natural stones, and for jewellers working out of Bowbazar and Burrabazar, that origin story is still what the end customer is paying for.
Available to buyers in Kolkata:
Lab Grown Diamond Supplier in Kolkata
Lab grown diamonds are chemically and optically identical to natural stones. The only real difference is how they’re formed, using HPHT or CVD technology in a lab setting instead of underground pressure over millions of years. Younger Kolkata buyers and value focused retailers have taken to lab grown fast, since it lets them hit a lower price point without giving up on grading standards. We supply:
- Round and fancy shape lab grown diamonds
- Certified lab grown diamonds with full grading documentation
- Rose cut and mix cut fancy lab grown diamonds
- Loupe clean and white lab grown diamond categories
- Solitaire grade certified lab grown diamonds
Loose Diamond Supplier in Kolkata
What we supply is unset, loose diamonds, nothing more. Jewellers and manufacturers across Kolkata take it from there and set it under their own brand. We stay out of the finished jewellery side of the business entirely; we just supply what goes into it.
Diamond Shapes Available in Mumbai
We select parcels across all eleven commercially traded diamond shapes that jewellers in Kolkata order for bridal jewellery, engagement rings, and fashion pieces.
ROUND
PRINCESS
CUSHION
OVAL
EMERALD
HEART
PEAR
MARQUISE
ASSCHER
RADIANT
ROSE
Certified Diamond Supply & Wholesale Services in Kolkata
Diamond sizes, certified supply, custom sourcing, wholesale terms, and secure delivery for jewellery businesses across Kolkata.
Stock ranges from melee sizes for pavé and accent work up to solitaire grade centre stones for bridal pieces. Carat availability is confirmed against live inventory at the time of enquiry, since stock and pricing shift daily.
Every certified stone we supply carries a grading report with an independently verifiable report number. We supply diamonds certified by GIA (Gemological Institute of America) and IGI (International Gemological Institute), across both natural and lab grown categories.
GIA (Gemological Institute of America): the industry benchmark for strict, consistent grading.
- IGI (International Gemological Institute): a leading lab for both natural and lab grown certification, widely used across the trade.
Buyers in Kolkata with a specific order in mind can request:
- Custom carat and size ranges matched to a bridal or festive collection
- A specific shape mix, whether round only, fancy only, or a blend
- Certification tier by lab (GIA or IGI) to match your market positioning
- Natural, lab grown, or a combined natural and lab grown parcel
Every custom request is checked against current stock and certification availability before we confirm it, so the order that’s placed is the order that ships.
We supply jewellery manufacturers, wholesalers, and retailers right across the city, from established Bowbazar and Burrabazar trading houses to smaller retail jewellers in Gariahat, Park Street, and Camac Street.
Bulk is the standard here, not the exception. We work in carat ranges, shape mixes, and certification tiers rather than one-off retail sales, and order size is set by what a jeweller actually needs rather than a fixed minimum. Several of our Kolkata buyers start with a trial parcel before moving to a regular running order.
Every shipment is packaged to protect the stones in transit and sent through insured courier with tracking. GST invoicing and HSN classification are provided with each shipment, and certification documentation travels with the parcel so it can be checked against every stone on arrival. We include a standard conflict-free sourcing statement with each shipment, in line with Kimberley Process requirements.
Natural diamonds and lab grown diamonds fall under separate HSN classifications for GST purposes in India, and GJEPC guidance requires that invoices clearly state whether a stone is natural or lab grown. Every lab grown diamond we supply is certified and billed as lab grown from the start, so that classification is already built into your paperwork before the stone reaches you.
Area | Known For | We Supply |
Bowbazar | Kolkata’s main jewellery hub, gold, diamond, silver, and gemstone trade in one stretch | Natural Diamonds, Lab Grown, Loose Diamonds |
Burrabazar | One of the largest wholesale trading markets in the city | Natural Diamonds, Lab Grown, Loose Diamonds |
Esplanade | Central Kolkata retail and trading belt near Bowbazar | Natural Diamonds, Lab Grown, Loose Diamonds |
Gariahat | South Kolkata jewellery retail cluster | Natural Diamonds, Lab Grown, Loose Diamonds |
Park Street & Camac Street | Premium retail jewellers and boutique studios | Natural Diamonds, Lab Grown, Loose Diamonds |
Greater East India (West Bengal, Bihar, Jharkhand, Odisha, Assam) | Manufacturers and retailers sourcing through Kolkata as the regional gateway | Natural Diamonds, Lab Grown, Loose Diamonds |
Why Choose Mann Gems LLP
Jewellers and manufacturers across Kolkata work with Mann Gems LLP, a certified diamond supplier in Kolkata, for the same reason buyers everywhere do: a direct, certified supply chain with no reseller markup sitting between them and the stone.
- 15+ years of experience in the natural and lab grown diamond trade, established in 2005.
- GIA and IGI certified diamonds on every stone, independently graded before it ships.
- Trusted by 1,000+ clients globally, including jewellers based right here in Kolkata, built on repeat orders rather than one-off sales.
- Ethically sourced diamonds aligned with Kimberley Process standards.
- No reseller chain: certified stock delivered direct, instead of passing through two or three hands before it reaches Bowbazar or Burrabazar.
Send Your Diamond
Requirements
Our sourcing team responds within 4 business hours with a curated certified stone list and pricing. All inquiries are strictly confidential.
Natural Diamonds vs Lab Grown Diamonds: Quick Comparison
| Factor | Natural Diamonds | Lab Grown Diamonds |
|---|---|---|
| Origin | Formed naturally in the earth’s mantle over billions of years | Created in a controlled lab using HPHT or CVD technology |
| Composition | Pure carbon crystal structure | Identical carbon crystal structure |
| Certification | GIA, IGI | IGI |
| Typical Price Point | Higher, driven by rarity | Generally more accessible per carat |
| Resale Value | Higher and more stable long-term | Lower and more variable |
| Common UAE Buyer | Bridal, heirloom, investment-focused retailers | Fashion, volume, value-focused retail chains |
Diamond Glossary for Jewellers
Melee: small diamonds, generally under 0.18 carat, used for pavé and accent settings.
- Solitaire: a larger single stone set as the centre point of a ring or pendant.
- Loupe Clean (LC): a stone with no inclusions visible under 10x magnification, a common trade grading shorthand.
- Rose Cut: a flat-backed cut with a faceted dome top, popular in vintage-style and fashion jewellery.
- Mix Cut: a parcel containing a mix of shapes rather than a single uniform shape.
- Parcel: a batch of diamonds grouped by shape, size, and quality for wholesale sale.
- HPHT / CVD: the two methods used to grow lab grown diamonds, High Pressure High Temperature and Chemical Vapour Deposition.
Find Your Perfect Diamond Parcel
Talk to our Kolkata desk today, over call or WhatsApp. We get back to you within one business hour.
Frequently Asked Questions: Diamond Suppliers in Kolkata
Mann Gems LLP supplies GIA and IGI certified natural and lab grown loose diamonds direct to jewellers and manufacturers across Kolkata, cutting out the reseller chain that most Bowbazar buyers deal with.
Yes. A large part of our regular business is with traders and manufacturers working out of Bowbazar and Burrabazar.
There’s no fixed minimum. We supply single solitaires for custom orders and larger parcels for jewellers running festive or bridal collections.
Most orders are confirmed and dispatched within one to two business days once the requirement is finalized.
Yes. Natural diamonds and lab grown diamonds are classified under separate HSN codes for GST purposes, and every invoice we issue clearly states which category the stone falls under.
Yes, in round, fancy shape, rose cut, mix cut, and solitaire inventory, across both natural and CVD or HPHT lab grown categories.
Yes. We send HD video, 360 degree views, and certificate scans over WhatsApp or email, with a live video call if you’d prefer one.
No. Kolkata is primarily a trading and retail hub, mostly gold and finished jewellery, so almost all loose diamond stock reaching the city comes in from Mumbai or Surat, usually through several hands.
Yes. Kolkata acts as a trading gateway for a wider region, and we regularly supply retailers and manufacturers across West Bengal, Bihar, Jharkhand, Odisha, and the Northeast.
Shape, carat range, certification lab (GIA or IGI), and whether you need natural, lab grown, or a mix. The more specific the brief, the faster we can match it against live stock.
Yes, for established Kolkata jewellers with a track record of orders, we review running account terms on a case by case basis.
Yes, a lot of our regular Kolkata buyers started with a single trial parcel to check quality and service before moving to a running order.