Diamond Suppliers in USA
Wholesale Natural & Lab Grown Loose Diamonds for New York, Los Angeles, Dallas & Across the United States
Mann Gems LLP is a certified natural and lab grown diamond supplier working with jewelry manufacturers, wholesalers, and importers across the United States. We ship loose diamonds in bulk directly from our base at Bharat Diamond Bourse, with GIA and IGI certification on every stone and 15+ years in the natural and lab grown diamond trade.
Diamond Supplier in the USA: Natural & Lab Grown Diamonds for Wholesale Buyers
The US jewelry trade runs through a handful of hubs, chief among them Manhattan’s Diamond District on 47th Street and the Jewelry District in downtown Los Angeles, alongside the annual JCK Las Vegas show that draws buyers from every region of the country. Most of the supply moving through those hubs still passes through at least one domestic reseller before it reaches a manufacturer’s bench. Mann Gems removes that layer. We supply natural diamonds and lab grown diamonds straight from source in India, so US manufacturers and wholesalers are buying closer to where the stone was actually cut and certified.
That matters most for businesses running their own production, private label lines, or import operations, where margin is won or lost in the sourcing step, not the retail step. We work with US buyers on carat range, shape mix, and certification tier, and confirm pricing against live international market rates rather than a marked-up domestic sheet.
Diamond Quality Standards
Every diamond we supply, natural or lab grown, is checked against the 4Cs before certification:
- Cut: governs how light returns off the stone, the main driver of visible sparkle.
- Color: the scale from colorless to faint yellow; colorless commands the premium.
- Clarity: internal and surface characteristics; fewer inclusions means a rarer, more valuable stone.
- Carat: raw weight, with price accelerating disproportionately as size increases.
Finish and symmetry are reviewed on top of the 4Cs, so what a manufacturer receives matches exactly what was quoted, no surprises on unboxing.
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What We Supply: Natural & Lab Grown Diamonds
We supply both natural diamonds and lab grown diamonds to jewelry manufacturers, wholesalers, and importers across the US, each independently certified before it ships. Here’s the breakdown:
Natural Diamonds: Earth Mined Brilliance, Sourced at the Bourse
Natural diamonds take billions of years to form, and every stone we sell is graded on cut, color, clarity, and carat before it carries a certificate. For US bridal and heirloom-focused manufacturers, that provenance is still the selling point their end customer pays for.
Natural diamonds remain the preferred choice for USA jewellery manufacturers producing bridal, investment, and heirloom-grade jewellery, where provenance and long-term value retention matter most to end customers.
Lab Grown Diamond Supplier for the US Market
Lab grown diamonds share the exact chemical and optical makeup of natural stones. The difference is entirely in how they’re formed: HPHT or CVD technology in a controlled setting rather than underground pressure over geologic time. US demand for certified lab grown stock keeps climbing, largely because it lets manufacturers hit a lower price point without cutting corners on grading. We supply:
Loose Diamond Supplier to the USA
What we ship is unset, ungraded-into-jewelry stone, plain and simple. US manufacturers, designers, and wholesalers take it from there, setting and branding it under their own label. We’re not competing with your finished product; we’re supplying what goes into it.
Diamond Shapes Available
We cut and select parcels across all eleven commercially traded shapes US manufacturers order for engagement rings, bridal sets, and fashion jewelry.
ROUND
PRINCESS
CUSHION
OVAL
EMERALD
HEART
PEAR
MARQUISE
ASSCHER
RADIANT
ROSE
Certified Diamond Supply & Wholesale Services in USE
Diamond sizes, certified supply, custom sourcing, wholesale terms, and secure shipping for jewelry businesses across the US.
Stock spans melee sizes for pave and accent work through solitaire grade centre stones for bridal and investment pieces. Carat availability is confirmed against live inventory at the time of enquiry, since pricing shifts with the market daily.
Every certified stone we send carries a grading report and 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 strictness and consistency in grading.
- IGI (International Gemological Institute): a leading lab for both natural and lab grown certification.
US buyers with a specific production run in mind can request:
- Custom carat and size ranges matched to a manufacturing schedule
- A specific shape mix, whether round only, fancy only, or blended
- 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 what’s ordered is what actually ships.
We ship to jewelry manufacturers, wholesalers, and importers across the country, from established Diamond District firms to newer direct-to-consumer brands sourcing their own stock for the first time.
Cities We Serve
- Diamond Supplier in New York
- Diamond Supplier in Los Angeles
- Diamond Supplier in Dallas
- Diamond Supplier in Miami
- Diamond Supplier in Chicago
- Diamond Supplier in Las Vegas
- Diamond Supplier in Atlanta
- Bulk is the model, 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 manufacturer actually needs rather than a fixed minimum. A number of US clients start with a trial parcel before committing to a running production order.
Every shipment is packaged to protect stones in transit and shipped internationally with insurance coverage. Certification documentation travels with the shipment so it can be checked against each stone on arrival. Loose, unmounted diamonds generally enter the US duty free under the applicable tariff classification, and we include a standard conflict-free sourcing statement with each shipment in line with the Kimberley Process system of warranties. We’d still recommend confirming current import requirements with your customs broker for your specific shipment.
If you’re reselling lab grown diamonds in the US, the Federal Trade Commission’s Jewelry Guides require clear disclosure that a diamond is lab grown or man made at the point of sale, it can no longer be marketed as simply “diamond” without that qualifier. Every lab grown stone we supply is documented and certified as lab grown from the outset, so that disclosure requirement is already built into your paperwork before the stone reaches your bench.
Why Choose Mann Gems
- 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, built on repeat orders rather than one-off sales.
- Ethically sourced diamonds aligned with Kimberley Process standards.
- Both natural and lab grown supply from one relationship, so US buyers aren't managing two separate vendors for two categories.
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 | GIA, IGI, GCAL |
| 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 USA Buyer | Bridal, heirloom, investment-focused retailers | Fashion, volume, value-focused retail chains |
Find Your Perfect Diamond Parcel
Talk to our Mumbai desk today. We get back to you within one business hour.
Frequently Asked Questions – Wholesale Diamond Suppliers in USA
Mann Gems supplies GIA and IGI certified natural and lab grown loose diamonds direct from India, cutting out the domestic middleman layer most US wholesale pricing is built around.
We currently supply GIA and IGI certified diamonds, the two most globally recognized labs for both natural and lab grown stones. We don’t offer AGS or EGL certification at this time.
Yes. FTC Jewelry Guides require clear disclosure that a stone is lab grown or man made at the point of sale. Every lab grown diamond we supply is certified and documented as lab grown from the start, so that disclosure is already covered in your paperwork.
Loose, unmounted diamonds typically enter the US duty free under the standard tariff classification. We include a conflict-free sourcing statement with each shipment, in line with Kimberley Process requirements, but recommend confirming current specifics with your customs broker.
There’s no fixed minimum. We supply single solitaires for custom orders and larger parcels for manufacturers running production.
Yes, in round, fancy shape, rose cut, mix cut, and solitaire inventory, across both natural and CVD or HPHT lab grown categories.
You share carat, shape, and certification requirements, we match it against current stock, confirm grading and live market pricing, and ship internationally with insurance once the order is confirmed.
Yes. We send HD video, 360 degree views, and certificate scans over WhatsApp or email, and can set up a live video call if you want one.