What Worldwide Diamond Manufacturers does

Worldwide Diamond Manufacturers (WDM), established in 1997 in Visakhapatnam, India, is a B2B diamond cutting and polishing contract manufacturer operating as a 100% export-oriented unit within the Visakhapatnam Special Economic Zone. WDM is the founding entity of Constell Group, a diversified diamond-services conglomerate headquartered in Mauritius that, through wholly-owned subsidiaries, delivers an integrated platform spanning rough sorting, diamond cutting and polishing, lab-grown diamond processing, jewellery manufacturing, consultancy, and turn-key facility setup. The group employs approximately 2,800+ people across entities including WSDM (Bhopal, ~1,500 employees, small-diamond polishing), WDJM (Visag, ~750 employees, LGD and jewellery), WDS (Visakhapatnam, ~250 employees, rough sorting at ~750,000 carats/month), and WDM-B (Botswana, large-stone polishing from 0.30 to 25 carats).

Core technical capability covers diamond polishing from 0.25 to 5 carats across the full quality spectrum — AGS000 + H&A, GIA/HRD 3EX, VG, GD, and Commercial make — alongside a comprehensive ERP system spanning finance, compliance, import/export, scheduling, and maintenance. Most recently, the group has integrated advanced AI learning software into its Dubai-based WCDS subsidiary (2024) for high-speed automatic rough sorting. All operating entities are ISO 9001:2015 and Responsible Jewellery Council certified, which is commercially material in a sector where ethical sourcing and chain-of-custody are procurement prerequisites.

The business model is fee-for-service contract work: clients (mining companies, manufacturers, traders, retailers, governments, and industry bodies) retain ownership of rough or polished diamonds while WDM/Constell provides processing services billed on a contract basis. Revenue is generated through service fees across the full diamond pipeline, with the mining sector as the primary segment and traders, retailers, and R&D as secondary. Go-to-market is sales-led and relationship-driven, leveraging direct enterprise engagement and a global network of representative offices across the USA, Canada, Belgium, Switzerland, Israel, UAE, India, China, Namibia, Botswana, and South Africa.

Name

Worldwide Diamond Manufacturers

Legal name

Worldwide Diamond Manufacturers Pvt. Ltd

Website

https://constellgroup.com

Company type

Private

Founded year

1997

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Worldwide Diamond Manufacturers is a B2B diamond cutting, polishing, and sorting contract manufacturer founded in 1997 in Visakhapatnam, India, serving enterprise clients across the global diamond pipeline — from miners and manufacturers to traders and retailers — through its parent Constell Group's integrated network.

Ownership category

akta.pro rank

Product category

Diamond Manufacturing Services

SIC

Jewelry, Precious Metal (3911)

akta.pro primary industry

Diamond Cutting & Polishing (Manufacturing) (CRAKAJAA)

akta.pro secondary industries

Fine Jewelry Manufacturing (Precious Metals & Gem-Set) (CRAKAIAA), Synthetic/Lab-Grown Diamonds & Gemstones (Manufacturing & Trading) (CRAKAJAM), Rough Diamond Trading & Brokerage (CRAKAJAC), Polished Diamond Trading & Brokerage (CRAKAJAD)

Keywords

• Diamond cutting polishing
• Contract manufacturing services
• Rough diamond sorting
• Jewellery manufacturing services
• Diamond industry consultancy

Headquarters

HQ city

Visakhapatnam

HQ country

India

HQ region

Asia

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Contract Work Services: WDM provides diamond cutting and polishing contract work services to clients who own the goods, enabling them to benefit from high quality work that enhances the value of their goods. Revenue generated through service fees for processing clients' diamonds.
2. Sorting Services: Customized rough and polished diamond sorting services provided as per client requirements, generating revenue through sorting fees.
3. Contract Manufacturing Services: Professional contract work services to participants across the entire diamond pipeline – from governments, industry bodies, miners, manufacturers, and traders, all the way through to jewelers and retailers.

Go-to-market motion2 records

Distribution channels1 record

Marketing channels2 records

Core offering

Worldwide Diamond Manufacturers (WDM) provides diamond cutting and polishing contract work services as a 100% export-oriented unit in Visakhapatnam, India. The company polishes diamonds from 0.25 to 5 carats across multiple quality grades and provides customized rough and polished sorting, recut and repair services. WDM serves clients across the entire diamond pipeline — from governments, industry bodies, miners, manufacturers, and traders to jewelers and retailers — operating as part of the Constell Group's global network of diamond service companies.

Product overview

Constell Group (parent of Worldwide Diamond Manufacturers) operates as a platform of integrated diamond industry services comprising multiple specialized subsidiaries and service divisions. The core products include WDM (diamond cutting and polishing, est. 1997), WDS (rough diamond sorting and valuation, est. 2012), WSDM (small diamond manufacturing, est. 2012), WDM-B (Botswana manufacturing, est. 2015), WDJM (lab grown diamonds and jewellery, est. 2018), WCDS (automatic rough sorting in Dubai, est. 2024), and DMMC (management consultancy). Supporting service divisions offer Operations Management, Cutting and Polishing, Sorting Services, Turn-key Solutions, Consultancy Services, Contract Work Services, Jewellery Manufacturing, and Training Services. Geographic coverage spans India (Visakhapatnam, Bhopal), Botswana (Gaborone), USA, China, UAE (Dubai), Namibia, South Africa, Belgium, Switzerland, Israel, Canada, and Mauritius.

Differentiator

Problem solved

Functional benefit

Brands

• WSDM: Worldwide Small Diamond Manufacturers - focused on small diamond manufacturing
• WDS
• WDM-B
• WDJM
• WCDS
• DMMC
• Constell Asia
• Constell American Corp.

Products and services

• Diamond Cutting and Polishing Contract Services (WDM) Contract diamond cutting and polishing services for clients across the diamond pipeline, using latest technologies to deliver services across a wide range of diamond sizes, shapes, qualities, and colors, with grades including AGS000 + H&A, GIA 3EX/HRD 3EX, GIA VG/HRD VG, GIA GD/HRD GD, and Commercial make. Includes recut and repair services for polished diamonds.
• Cutting and Polishing Service Expert advice and assistance for establishing diamond cutting and polishing businesses, covering market understanding, sourcing, tools, and skilled staff recruitment. Backed by 25 years of operating experience.
• Sorting Services Contract sorting of rough and polished diamonds for polishing and mining companies and retailers at competitive rates. World's largest independent sorting entity with a workforce of 300 providing sorting and valuation services.
• Turn-key Solutions Assistance in setting up diamond grading laboratories with grading knowledge, skill, expertise, apt tools and equipment, qualified gemologists, diamond graders, and experts.
• Consultancy Services Expert advice and guidance for establishing diamond jewellery manufacturing units, helping with production management, capital planning, and providing tailor-made solutions aligned with client requirements.
• Contract Work Services Professional contract work services to participants across the entire diamond pipeline — from governments, industry bodies, miners, manufacturers, and traders, all the way through to jewelers and retailers.
• Jewellery Manufacturing Diamond jewellery manufacturing and management consultancy services along with diamond manufacturing software to help businesses establish in the jewellery sector.
• Training Services Training programs to assist workforce in understanding operations training needs and guide them in the right direction, drawing from 25 years of setting up and managing different diamond operations.
• Operations Management Expert advice regarding all aspects of setting up and operating a diamond business, from capital investment to physical setup with excellent infrastructure, including real-time business solutions for strategic operational decisions.
• Worldwide Diamond Manufacturers Botswana (WDM-B) Diamond cutting and polishing services in Botswana, polishing diamonds from 0.30 to 25 carats. Pioneered solar power implementation in Botswana's diamond industry, capable of returning around 80% of monthly power consumption.
• Worldwide Small Diamond Manufacturers (WSDM) Small diamond manufacturing services, polishing rough diamonds ranging from -11 to +1 with an average polished size of 8 cents. Employs around 1,500 people directly.
• Worldwide Diamond Sorting (WDS) Rough diamond sorting and valuation services that enable clients to maximize the value of their rough when selling by preparing selling assortments in a cost-effective manner with optimized cycle time.
• Worldwide Diamond and Jewellery Manufacturers (WDJM) Lab Grown Diamonds and jewellery services including cutting and polishing of LGDs, seed slicing, and jewellery manufacturing. Grown from 100 people to 750 employees.
• Worldwide Constell Diamond Services (WCDS) - High-speed Automatic Rough Sorting High-speed automatic rough sorting services using cutting-edge technology and advanced AI learning software integrated with state-of-the-art equipment for rapid, accurate assortments.
• Diamond Manufacturing Management and Consultancy (DMMC) Consultancy services and management guidance within clients' own manufacturing facilities worldwide, sharing the vast knowledge of the Constell Group with clients in Africa, India, USA, and China.

Quantifiable outcome

• Quality enhancement for clients' goods through expert cutting and polishing

Named customers2 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

One partnership is on record.

• Constell Group NetworkcoreStrategic or Co-development Partner · 1 January 1997WDM is the founding entity of the Constell Group, established in 1997 in Visakhapatnam, India. It operates as part of a global network including WSDM, WDM-B, WDS, WDJM, WCDS, DMMC, Constell American Corp., and Constell Asia, providing comprehensive services across the diamond pipeline.

Scale indicators4 records

Recent moves10 records

Expansion highlights6 records

Direct peers

• KGK Group: Vertically integrated Indian diamond miner, cutter, and jewellery manufacturer with global operations. Comparable to Constell Group's end-to-end diamond pipeline offering and presence in India.
• Almod Diamonds: Indian-headquartered rough and polished diamond manufacturer with international offices. Directly comparable to WDM in contract cutting and polishing services for global clients.
• Venus Jewel: India-based diamond manufacturer specializing in polished diamonds and solitaire cutting. Direct competitor in Indian contract manufacturing and comparable size and customer base to WDM.
• Rosy Blue: Global diamond cutter and supplier with manufacturing hubs in India, Botswana, and other key diamond centers. Directly comparable to WDM in cross-border contract cutting and rough processing.
• Diarough N.V. International diamond manufacturing and trading group headquartered in Antwerp with significant cutting capacity in India. Competes with WDM for natural-diamond contract work on a global scale.
• Hari Krishna Exports: One of India's largest diamond manufacturers with polishing and cutting operations serving global retailers. Direct competitor to WDM in natural-diamond contract manufacturing from India.
• Leo Schachter Worldwide: Globally diversified diamond cutter with operations in New York, Israel, India, and Africa. Comparable to WDM in serving large miners and retailers across multiple geographies.

Others

• Sarine Technologies: Provider of diamond manufacturing technologies including automated sorting, planning, and grading. The AI-driven sorting technology at WCDS overlaps with Sarine's tech offerings in the same value chain.

Broad incumbents

• Malca-Amit: Global group offering diamond, jewellery, and security services including cutting, polishing, and logistics. Comparable broader-service model to Constell's multi-entity platform.
• Laurelton Diamonds (Tiffany & Co.): In-house diamond sourcing and manufacturing arm of Tiffany & Co. Operates cutting facilities in Belgium, Botswana, and Vietnam. Comparable vertically integrated cutting operations but serves a single retail owner.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/worldwide-diamond-manufacturers-private-limited

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles13 records

Subsidiaries8 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 Worldwide Diamond Manufacturers