Rough Diamonds are the starting point of every polished gemstone. Before a diamond reaches the customer, manufacturers must carefully source these uncut stones from mining companies or global trading markets.

The sourcing method directly affects pricing, supply consistency, and final quality. Therefore, understanding how raw diamonds enter the supply chain helps explain differences in market value.

After sourcing, the stones move through several stages:

• • Sorting
• • Planning
• • Cleaving
• • Bruting
• • Polishing

How Rough Diamonds Enter the Market

Diamond manufacturers usually acquire their inventory in two main ways:

• Direct purchase from mining companies
• Secondary trading markets

Direct Purchase from Mining Companies

Large manufacturers prefer buying directly from mines because it ensures stable supply and predictable quality. Mining companies distribute parcels through:

• • Sight-holder system
• • Tenders and auctions

Sight-Holder System

Major mining groups organize invitation-only sales sessions where selected manufacturers purchase pre-assorted parcels of rough stones.

This approach guarantees consistent access. However, pricing flexibility remains limited.

Tenders and Auctions

In tenders, buyers inspect parcels and submit competitive bids. Unlike fixed allocations, this process depends on demand and bidding strategy.

Although tenders offer flexibility, they do not always ensure steady supply.

Secondary Trading Market

Global trading hubs such as Antwerp and Israel support additional supply through secondary markets. Manufacturers rely on this channel when they require extra inventory.

Prices in this segment fluctuate depending on supply and demand conditions.

Impact of Sourcing on Diamond Price

The sourcing route influences the final cost of polished diamonds. Direct supply often reduces intermediary expenses, while additional trading layers may increase pricing.

Moreover, consistent access to rough diamonds supports better production planning and quality control.

Our Approach to Responsible Sourcing

Hari Krishna Exports sources conflict-free rough diamonds directly from leading mining companies. This strategy strengthens quality control and ensures ethical practices.

Each polished stone is supported by in-house certification along with third-party grading for transparency.

Explore our GIA certified loose diamonds
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