Buy Diamonds · Mumbai / Surat
Source rough diamonds directly
into India.
OnePiece connects Mumbai and Surat diamond manufacturers with verified African and Russian rough diamond producers — direct supply, below secondary-market pricing, KP-certified, and sized for ongoing manufacturing relationships.
India's diamond manufacturing dominance
Surat, Gujarat, cuts approximately 90% of the world's diamonds by number — an extraordinary concentration of specialist skill. The city's 800,000 trained diamond workers process everything from sub-0.1ct melee to significant stones, with particular depth in the 0.1–2ct commercial range that drives the global bridal and fashion jewellery markets. Surat's factories operate at a cost base and at a throughput speed no other cutting centre can replicate.
Mumbai provides the commercial infrastructure that feeds Surat. The Bharat Diamond Bourse (BDB) in Bandra Kurla Complex is the world's largest diamond trading facility — a dedicated complex of 13 towers housing rough buying offices, polished trading floors, banking facilities, customs bonding, and logistics. The BDB was designed specifically to displace Antwerp as India's primary diamond import and export gateway, and it has largely succeeded in that ambition.
Together, Mumbai and Surat represent the single largest appetite for rough diamonds in the world. Indian manufacturers have an insatiable requirement for consistent rough supply, particularly in the 0.1–2ct size range that their factories process most efficiently. Meeting that appetite through direct sourcing — rather than secondary market purchases through Antwerp or Dubai intermediaries — is the structural challenge that OnePiece addresses.
Rough diamond economics for Indian manufacturers
A diamond manufacturer's margin is determined by a single equation: the price achieved for polished output minus the cost of rough input minus processing cost. Labour and overheads per carat are relatively fixed. The variable that most directly controls profitability is the rough acquisition cost. A manufacturer sourcing through secondary Antwerp markets is paying Antwerp-plus — the producing country price plus sorting, handling, and dealer margin through potentially two or three intermediaries.
Direct sourcing from African producers — at below Antwerp secondary market prices — compresses that cost structure significantly. For a Surat manufacturer processing 10,000 carats of rough per month, a 10% improvement in rough acquisition cost translates to meaningful annual profit improvement. The economics are clear. The friction has historically been access: African producers have not always had reliable routes to Indian buyers who are willing to handle direct-import compliance.
OnePiece provides that access. We connect Indian buyers with producers whose documentation package meets BDB import requirements, whose parcel quality is consistent with what Surat factories can process efficiently, and whose pricing reflects the direct-supply premium rather than Antwerp secondary market pricing.
What Indian manufacturers need from rough suppliers
Indian manufacturers are relationship-oriented buyers. Unlike Antwerp spot-market transactions, the preferred structure for Indian buying is an ongoing supply relationship with a specific producer or mine — monthly or quarterly parcels of consistent size distribution and quality, at a predictable price formula. The manufacturer's production planning depends on rough supply predictability; one-off spot purchases disrupt factory scheduling.
Parcel consistency is paramount. A factory geared to process 0.5–1ct rough cannot efficiently absorb a parcel heavy in 0.1ct melee. Sellers who can describe and guarantee a consistent size distribution — and who deliver that consistency shipment after shipment — command a premium over sellers offering run-of-mine unsorted material. We work with buyers to specify their preferred size and quality profile, and match that to producers whose output profile fits.
KP certification is required at import. India's customs and the BDB bonding facility require KP certificates on all rough diamond imports. Valuation for customs duty purposes must be by a recognised valuer or supported by an Antwerp or DMCC reference valuation. Sellers who arrive with inadequate documentation create customs delays and duty disputes — we ensure documentation is in order before any shipment departs origin.
Transaction parameters
Diamond type
Rough — run-of-mine and sorted parcels
Preferred size range
0.1–5ct (Surat manufacturing optimum)
KP certification
Mandatory at India import — BDB standard
Valuation
Antwerp or DMCC reference valuation required
Settlement
Wire against documents · BDB bonded delivery
India import duty
7.5% basic duty + GST — applicable, plan accordingly
Supply rhythm
Monthly or quarterly preferred over spot
Min parcel
500 carats per shipment
Tell us your manufacturing sourcing requirement.
Monthly volume, preferred size range, quality grade, origin preference — describe your brief and we will source against it. WhatsApp for immediate response.
WhatsApp +60 19-873 8500