Diamond Counsellor international

What Diamond Counsellor international does

Diamond Counsellor International (DCi) is a privately held, family-controlled rough diamond valuation and consultancy firm founded in 1970 by Martyn Marriott, formerly of the De Beers group. Headquartered in Newton Abbot, United Kingdom, and originally established as Government Diamond Valuator (GDV) in Botswana, DCi now operates across eight diamond-producing jurisdictions through dedicated subsidiaries and joint ventures. Its client base is dominated by sovereign governments (Angola, Lesotho, Sierra Leone, Guinea, Liberia, Central African Republic, and the Government of Quebec in Canada), with secondary engagements from private mining companies (Gem Diamonds, Stornoway, Dominion Diamond, Guiter Mining, Vaaldiam) and international agencies (the Kimberley Process, World Bank, UN agencies, SECO, Enabel). The firm handles over $1.5bn of rough diamonds annually, representing approximately 10% of global production by value and volume, and its expert valuators undertake an estimated 20% of the world's rough diamond valuations annually.

DCi's core offering is built around a proprietary valuation software system that uses a fixed pricing methodology to categorise rough diamonds by size, shape, colour, quality, yield potential, and gem/industrial classification, producing transparent valuations suitable for Kimberley Process Certification Scheme compliance. Surrounding this technology, the firm delivers a portfolio of professional services: independent GDV and check valuations, statistical analysis and modelling, strategy and marketing consultancy, sales organisation assistance (CSO, tender, direct-to-market), and structured training and skills transfer programmes for national personnel. The proprietary system has been approved by Kimberley Process peer review missions in Angola and Guinea.

DCi monetises services primarily through long-term government GDV contracts awarded via competitive international tender, supplemented by private mining company commissions, donor/development agency consultancies, and training engagements. It distributes services directly at source in each producing country via locally incorporated subsidiaries (Diamond Counsellor Angola, Diamond Counsellor Lesotho, Diamond Counsellor Namibia) and via ADCi, a 2007 joint venture with R.T. Boyd Ltd that services the Canadian market. Sales are relationship-driven and consultative, targeting government ministries and mining executives through reputation, Kimberley Process participation, and World Diamond Council membership rather than digital or transactional channels. The firm maintains a deliberately small core employee base, with on-the-ground operations staffed by national valuators in each jurisdiction.

Name

Diamond Counsellor international

Legal name

Diamond Counsellor International

Website

https://diamondcounsellor.com

Company type

Private

Founded year

1970

Operating status

Operating

Headcount range

1–10 employees

Short description

Diamond Counsellor International is a privately held rough diamond valuation and consultancy firm founded in 1970, serving governments of diamond-producing countries, mining companies, and development agencies. It serves as Government Diamond Valuator across eight jurisdictions via proprietary valuation software and senior expert valuators.

Ownership category

akta.pro rank

Product category

Rough Diamond Valuation and Consultancy

NAICS

Support Activities for Nonmetallic Minerals (except Fuels) Mining (213115), Marketing Consulting Services (541613)

akta.pro primary industry

Diamond Grading & Certification Laboratories (CRAKAJAG)

Keywords

• Rough diamond valuation
• Diamond consultancy services
• Kimberley process certification
• Mineral sector advisory
• Government diamond valuation

Headquarters

HQ city

Newton Abbot

HQ country

United Kingdom

HQ region

Europe

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Government Diamond Valuation (GDV) Contracts: DCi holds long-term GDV contracts with multiple diamond-producing governments (Angola, Lesotho, Sierra Leone, Guinea, Liberia, Central African Republic, and Quebec), providing independent valuation services. Revenue is generated through contractual fees for valuing export shipments and run-of-mine productions.
2. Private Mining Company Valuations: DCi provides independent valuation and consultancy services to private mining companies and financial institutions, including check valuations, bulk sampling analysis, and market advice.
3. Training and Skills Transfer Services: DCi delivers training programmes to local personnel in valuation methods, and knowledge transfer to build national capacity in diamond-producing countries.
4. Strategy and Marketing Consultancy: DCi advises governments and mining companies on diamond marketing strategy, certification, Kimberley Process compliance, and management of alluvial diamond mining operations.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels3 records

Core offering

Diamond Counsellor International provides independent rough diamond valuation, statistical modelling, and pricing analysis to governments, central banks, and mining companies. The firm also delivers consultancy, sales-organisation support, and Kimberley Process-related services, alongside localisation and training programmes for state diamond valuators. Its work is underpinned by its proprietary DCi Valuation Software System.

Product overview

Diamond Counsellor International (DCi) is a specialized diamond valuation and consultancy firm offering a unified service portfolio centered on rough diamond valuation. The core offering consists of proprietary DCi Valuation Software System combined with professional services including government diamond valuation (GDV) services, consultancy, localisation and training, sales organisation assistance, and statistical analysis. DCi operates through regional subsidiaries including ADCi (Canada), Diamond Counsellor Angola (DCA), and Diamond Counsellor Lesotho (DCL). The company also provides Kimberley Process Certification Scheme implementation support. Handling over $1.5bn worth of rough diamonds annually, representing approximately 10% of global production by value and volume.

Differentiator

Problem solved

Functional benefit

Quantifiable outcome

• Handles over $1.5bn worth of rough diamonds every year – approximately 10% of global production by value and volume
• +1 more outcomes

Named customers21 records

Segments4 records

Ideal customer profiles2 records

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

Five partnerships are on record, tiered core.

• R.T. Boyd LtdcoreStrategic or Co-development PartnerADCi is a partnership formed in 2007 between DCi Directors and R.T. Boyd Ltd to create a resident Canadian company qualified to secure Canadian and Provincial Government and mining industry valuation, modelling and statistical analysis contracts. Warren Boyd is President of R.T. Boyd Ltd and a founding partner in ADCi.
• World Diamond CouncilcoreStrategic or Co-development PartnerDCi is a member of the World Diamond Council, whose primary mission is to represent the diamond industry in the development and implementation of regulatory and voluntary systems to control the trade in diamonds embargoed by the UN or covered by the Kimberley Process Certification Scheme. Martyn Marriott contributed to the formation of the KP and is a member of the WDC.
• Diamond Counsellor Angola (DCA)coreStrategic or Co-development PartnerDCA is a locally owned off-shoot of DCi established to serve as valuator and consultant to Endiama and Sodiam, the state companies controlling all diamond activities in Angola. Isaac Andre Buca is Managing Director of DCA.
• Diamond Counsellor Lesotho (DCL)coreStrategic or Co-development PartnerDCL is a subsidiary of DCi set up specifically to service the Lesotho GDV contract awarded in November 2014 following a competitive international tender process.
• Algonquian Diamond Counsellor International (ADCi)coreStrategic or Co-development PartnerADCi is a partnership between DCi Directors and R.T. Boyd Ltd, established in 2007 to create a Canadian company qualified to secure Canadian Government and mining industry contracts. ADCi won the Quebec GDV contract in 2017 and has been contracted by the Government of Quebec for government diamond valuation services since 2017.

Scale indicators4 records

Recent moves8 records

Expansion highlights4 records

Direct peers

• Bonas Group: Bonas is a long-established international diamond consultancy and brokerage that provides rough and polished diamond advisory, valuation and marketing services to governments, producers and investors, making it the closest direct competitor to DCi in rough diamond advisory work.
• Rapaport Group: Rapaport is the leading global diamond price-list and trading-network provider, offering market intelligence, pricing benchmarks and rough diamond services that overlap with DCi's statistical analysis and market advisory functions.
• WWW International Diamond Consultants: WWW (formerly part of the De Beers/HRD ecosystem) is a specialist international rough diamond consultancy providing valuation, marketing strategy and auction services to producing governments and miners, directly comparable to DCi's GDV and consultancy offering.

Broad incumbents

• HRD Antwerp: HRD Antwerp is a leading European diamond grading and certification laboratory that also provides rough diamond services, training and equipment, overlapping with DCi's grading, certification and training offerings at a broader-institutional scale.
• Gemological Institute of America (GIA): GIA is the world's foremost diamond grading and gemmological research institution; its grading reports and standards underpin the certification ecosystem in which DCi's valuation software operates, making it a broad incumbent in adjacent diamond evaluation services.
• International Gemological Institute (IGI): IGI is a global diamond and gemstone grading laboratory with training programmes and rough diamond services, comparable to the certification, training and grading aspects of DCi's business.

Others

• De Beers Group: De Beers is the world's largest rough diamond miner and marketer through its DTC/CSO auctions; DCi's founder Martyn Marriott and several senior valuators are ex-De Beers, and De Beers historically contracted DCi as an independent valuator, making it a structurally significant adjacent player rather than a competitor.
• Rosy Blue: Rosy Blue is a major international rough and polished diamond manufacturer with deep relationships across African producing countries; while not a direct valuation competitor, it operates in the same producing-country ecosystems and uses independent valuators like DCi.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/diamond-counsellor-international-dci-

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 records

Subsidiaries4 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Diamond Counsellor international