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1-415-518-0710CrownStone Diamonds is a trusted diamond trading company that connects the world's finest producers with leading buyers across the global market. We source rough diamonds directly from established mining regions and supply a curated portfolio of certified polished diamonds to wholesalers, retailers, jewellery brands and institutions.
We trade diamonds from four of the world's most significant diamond-producing nations: Botswana, Canada, Namibia and South Africa. Each region has its own sourcing narrative, regulatory framework and community impact story — and we bring all of that together in one place.
Every stage of a diamond's movement is assessed for potential risks as part of the Best Practice Principles and OECD Due Diligence Guidance. We cross-reference Kimberley Process certificates, blockchain traceability records and supply chain documentation to create a verified provenance record for every stone we trade.
Yes. We offer single stone purchases, regular wholesale supply through a Trade Account, and bespoke sourcing mandates for manufacturers, retailers and institutions. Reach out via our contact page with your specifications and we'll match you with the right stones.
Typical turnaround depends on the complexity of the order. Single certified stones can often be delivered within a few working days, while larger parcels and bespoke sourcing mandates may take longer. We'll confirm timelines when you submit your enquiry.
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The Best Practice Principles are a set of ethical standards established in the early 2000s to promote the highest business conduct across the diamond pipeline. They cover four core responsibility areas — Business, Social, Environmental and Mining — ensuring that diamonds from CrownStone Diamonds meet the highest professional, ethical and technical standards.
The Kimberley Process Certification Scheme is the foundational international standard for conflict-free diamonds. Every diamond we trade is certified under the Kimberley Process, ensuring it is sourced from legitimate origins and not used to finance conflict. We also follow the World Diamond Council's System of Warranties and OECD Due Diligence Guidance.
Yes. Every polished diamond we supply is accompanied by independent grading reports from recognised laboratories such as GIA, IGI or HRD. We also coordinate certification and grading support for our trade partners — ensuring every stone we trade meets the standards our clients expect.
Rough diamonds are supplied directly from established producers and matched to the manufacturing requirements of cutters and polishers. Polished diamonds are supplied from our curated portfolio across all shapes, sizes and qualities — ready for wholesalers, retailers and jewellery brands. Both channels are backed by certified provenance.
CrownStone Diamonds is a business-to-business trading company. We supply rough and polished diamonds to manufacturers, wholesalers, retailers, jewellery brands and institutions. If you are a private collector, we can connect you with our retail partners.