Diamond supplier & exporter in India — lab grown and natural.

Tiwari Groups International connects international buyers with verified diamond manufacturers, cutters and polishers in Surat, Gujarat — the city that cuts and polishes the large majority of the world’s diamonds by volume and has become a leading global hub for lab grown diamond (CVD/HPHT) production alongside its traditional natural diamond trade. We source both lab grown and natural diamonds through our Surat partner network, and treat these as two distinct supply chains with different compliance requirements — not interchangeable categories — because that distinction matters to buyers, regulators and certification bodies alike. If you are a jewelry brand, wholesaler or private label buyer looking to source diamonds from India, this page explains how each supply chain works and what to expect from us as a sourcing partner.

Lab grown vs. natural diamonds — what we source

We deliberately separate these two supply chains rather than blending them, because the compliance path, certification and buyer expectations differ.

Looking for a specific carat range, shape or certification body? Send your specification and we’ll confirm what our Surat network can supply.

Why buy diamonds from Surat, India

Surat is widely described as the world’s diamond cutting and polishing capital — the large majority of the world’s diamonds, by volume, pass through Surat’s cutting and polishing units regardless of where they were originally mined or grown. Alongside its century-long natural diamond trade, Surat has become a leading global centre for lab grown diamond (CVD and HPHT) production over the past decade, with dedicated growing, cutting and polishing infrastructure now operating at scale. IGI operates a certification and grading laboratory directly in Surat, so stones can be graded close to where they’re cut rather than shipped elsewhere first. Buyers typically source from Surat for competitive factory-direct pricing, deep specialisation in both cutting and (for lab grown) growing, and access to certification infrastructure in one location.

Business models we support

Loose stone supply for jewelry manufacturers

We supply certified loose diamonds — lab grown or natural, per your specification — for buyers who set stones themselves or work with third-party jewelry manufacturers.

Private label & branded jewelry programs

For brands that want finished jewelry rather than loose stones, we coordinate with jewelry manufacturing partners in our network to combine stone sourcing with setting, under your branding.

Bulk & wholesale supply

For wholesalers and distributors ordering at volume, we negotiate factory-direct pricing and consistent grading standards across repeat orders.

Custom specification sourcing

Tell us your target carat range, shape, clarity and colour grade, and budget — we’ll source matching certified stones from our Surat network rather than a fixed catalogue.

Certification, grading & quality control

Every stone we supply carries independent grading from GIA or IGI — covering the 4Cs (cut, clarity, colour, carat) — and lab grown stones are explicitly certified as lab grown, never sold or represented as natural. For natural diamonds, we source only through channels compliant with the Kimberley Process Certification Scheme, the international system that tracks rough diamonds to prevent conflict-diamond trade; the Kimberley Process does not apply to lab grown diamonds since they are not mined, which is one of several reasons we treat the two supply chains separately rather than blending them. Every order goes through our documented quality control process — stone verification against certification, in-line checks during any setting work, and final inspection before shipment, with documentation at each stage.

MOQ, lead time & pricing

Diamonds are priced and ordered per stone or per carat rather than by a fixed MOQ in the way bulk manufactured goods are — pricing depends on the 4Cs, whether the stone is lab grown or natural, and current market rates, so we don’t publish flat pricing. Lead time for loose certified stones is typically faster than manufactured goods since it depends on sourcing and certification verification rather than production; jewelry-setting programs add the manufacturing timeline of the jewelry unit involved. Send your specification and target budget and we’ll return a sourcing quote with certification details.

Export, shipping & countries served

We export certified diamonds to buyers across North America, the UK, EU, Middle East, Australia and Asia, handling secure shipping, export documentation (including the Kimberley Process certificate for natural stones and the grading certificate for all stones) and customs coordination through to your destination. See our full sourcing and export process for how an order runs start to finish.

Why buyers choose Tiwari Groups International

Because we operate as the trading name of a registered Indian company, Wickbond Private Limited, every contract, invoice and shipment carries the accountability of a verifiable legal entity — important in a category where trust and certification integrity matter as much as price. We keep lab grown and natural supply chains explicitly separated in how we source, certify and represent stones to you, rather than blurring the distinction. Read more about our company and sourcing strength.