What Storm Mountain Diamonds - Kao does

Storm Mountain Diamonds (Pty) Ltd operates the KAO diamond mine in the Butha Buthe District of Lesotho, a single-site open-pit kimberlite mining operation founded in 2010 after the previous operator, Kao Diamond Mine, was liquidated in 2009. The company is jointly owned by Namakwa Diamonds Limited (the strategic operating parent) and the Government of Lesotho, and employs almost 800 people, of whom 97% are Lesotho citizens and 34% come from the surrounding local village. The KAO Main Kimberlite Pipe covers 19.8 hectares and is the largest kimberlite in Lesotho and the fourth largest in Southern Africa. The company maintains a corporate office in Maseru and is led by Corporate CEO Neo Hoala, who was appointed in August 2024.

KAO's core product is rough diamond production from kimberlite ore, processed through an on-site plant that includes a Final Recovery facility with sorting glove boxes. The mine is differentiated by its consistent recovery of exceptional pink, purple, and Type IIa diamonds — the most chemically pure and valuable diamond category — including the Lesotho Pink Storm (36.06ct), Purple Princess (3.06ct), Rose of KAO (29.59ct), Pink Dawn (25.97ct), Pink Palesa (21.86ct), Pink Eternity (47.80ct), a 168.87ct Type IIa gem-quality stone, and a 108.39ct fancy intense pink recovered in March 2023. Value-added services include Diamond Provenance Documentation and GIA Diamond Origin Reports that certify geographic origin and 4Cs grading. Corporate social investment programs operate as a distinct sub-brand focused on education, skills training, sustainable income, and community health.

Revenue is generated entirely through rough diamond sales via the Bonas Group tender system in Antwerp, with viewings extended to New York and other locations for special stones. Special single stones — typically above 5 carats — contribute approximately 40% of revenue, well above international averages for diamond mines, with pricing set by competitive bidding. Customers are specialist diamond buyers, collectors, and luxury jewelry manufacturers, predominantly reached through Antwerp tenders with international attendance from Asia, the Middle East, Europe, and the Americas. The company holds Responsible Jewellery Council certification (renewed 2024) and was among the first mines to achieve G7 certification in 2024 for compliance with restrictive measures on Russian diamonds, in addition to standard Kimberley Process compliance.

Name

Storm Mountain Diamonds - Kao

Legal name

Storm Mountain Diamonds (Pty) Ltd

Website

https://stormmountaindiamonds.com

Company type

Private

Founded year

2010

Operating status

Operating

Headcount range

101–250 employees

Short description

Storm Mountain Diamonds (Pty) Ltd operates the KAO diamond mine in Lesotho, the country's largest kimberlite pipe and fourth largest in Southern Africa. The company produces and tenders exceptional pink, Type IIa, and fancy colored rough diamonds globally through the Bonas Group in Antwerp.

Ownership category

akta.pro rank

Product category

Diamond Mining

NAICS

Nonmetallic Mineral Mining and Quarrying (2123), Other Nonmetallic Mineral Mining and Quarrying (212390)

SIC

Mining & Quarrying Of Nonmetallic Minerals (No Fuels) (1400)

akta.pro primary industry

Rough Diamond Trading & Brokerage (CRAKAJAC)

akta.pro secondary industry

Rough Gemstone Trading & Brokerage (CRAKAJAE)

Keywords

• Kimberlite diamond mining
• Rough diamond production
• Fancy pink diamonds
• Type IIa diamond mining
• Diamond tender sales

Headquarters

HQ city

Butha Buthe District

HQ country

Lesotho

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Supply Chain, Infrastructure, Marketing or Sales

Revenue model

1. Rough Diamond Sales: The company operates a kimberlite diamond mine and generates revenue through the sale of rough diamonds via tender in Antwerp. Special single stones contribute approximately 40% of revenue. Diamonds are sold through Bonas Group as contracted diamond tender broker, with viewings and tenders conducted in Antwerp.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

Storm Mountain Diamonds operates the KAO kimberlite diamond mine in Lesotho, conducting open-pit mining and recovery of rough diamonds including rare pink and purple fancy colored diamonds, Type IIa white diamonds, and large gem-quality stones. The mine produces rough diamonds that are sold through the Bonas Group tender system in Antwerp, with special single stones contributing approximately 40% of revenue. Notable recoveries include the 108.39-carat pink diamond, Pink Eternity (47.80ct), Rose of Kao (29.59ct), Pink Dawn (25.97ct), and Pink Palesa (21.86ct).

Product overview

Storm Mountain Diamonds (SMD) operates a single-site kimberlite diamond mining business at the KAO mine in Lesotho. The product portfolio centers on the mine's core operation (KAO Diamond Mine Operations) and is differentiated by its specialty production of exceptional Fancy Pink Diamonds — including the Lesotho Pink Storm (36.06ct), Pink Eternity (47.80ct), Rose of Kao (29.59ct), Pink Dawn (25.97ct), and Pink Palesa (21.86ct) — alongside large Type IIa white stones and fancy colored diamonds. Revenue is derived from two main streams: Special Single Stone Tender sales of exceptional individual diamonds (contributing ~40% of revenue) through Bonas Group auctions, and KAO ROM (Run-of-Mine) production sold via the same tender platform. Added-value services include Diamond Provenance Documentation and GIA Diamond Origin Reports, which provide buyers with full traceability and grading confirmation. CSR and Community Investment Programs operate as a distinct sub-brand focused on education, income generation, and health for surrounding communities. The company is jointly owned by Namakwa Diamonds Limited and the Lesotho Government.

Differentiator

Problem solved

Functional benefit

Brands

• KAO Foundation: Employee-founded charitable foundation where mine employees donate to the needy independent of the mine's CSR program.

Products and services

• KAO Diamond Mine Operations Kimberlite diamond mining operations at Kao in Lesotho, producing high-value Type IIa white, pink, and fancy colored diamonds. The mine is the largest kimberlite pipe in Lesotho and fourth largest in Southern Africa.
• Special Single Stone Tender Special single stone sales program where exceptional diamonds, typically above 5 carats including large Type IIa whites and colored stones, contribute approximately 40% of mine revenue, sold through Bonas Group tender auctions in Antwerp.
• KAO Run-of-Mine Diamond Sales Regular sale of run-of-mine diamond production from the KAO mine through Bonas Group tender auctions, including special single-stone tenders held multiple times per year from 2022 to 2025.
• 168-Carat Type IIa Gem Quality Diamond A 168.87-carat pre-boil (168.49ct post-boil) Type IIa gem quality diamond recovered at KAO mine, representing one of the largest gem-quality diamonds produced at the operation.

Quantifiable outcome

• Revenue contribution from special single stones is approximately 40%
• +3 more outcomes

Named customers2 records

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Partnerships

Six partnerships are on record, tiered core, major and minor.

• Choron BVcoreGTM or Marketing Partner · 6 December 2023Leading diamond company founded in 1985, specialized in manufacturing of exceptional rough diamonds. Entered agreement with SMD for the 108.39 carat pink diamond. Both companies are members of the Responsible Jewellery Council.
• DiamcadmajorGTM or Marketing Partner · 27 February 2023Diamcad is a diamond trading company that visited the KAO mine site in February 2023. Representatives visited to understand operations and view diamonds.
• Bonas GroupcoreChannel Partner/ Reseller/ DistributorBonas Group serves as the contracted diamond tender broker for Storm Mountain Diamonds, conducting tenders and viewings in Antwerp for KAO diamonds.
• Responsible Jewellery CouncilcoreOthersWorld's leading standard-setting organization for the jewellery and watch industry. SMD is a certified member, ensuring responsible standards are upheld across operations.
• GIA (Gemological Institute of America)majorTechnology or IntegrationGIA provides Diamond Origin Reports that confirm geographic origin of KAO diamonds, helping distinguish natural from laboratory-grown diamonds and building trust with consumers.
• Lesotho Chamber of MinesminorOthersIndustry body representing Lesotho mining operations. SMD is a member and featured in Chamber publications.

Scale indicators5 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Petra Diamonds: Operates multiple kimberlite diamond mines (Cullinan, Finsch, etc.) producing high-value gem-quality and Type IIa diamonds. Comparable business model spanning diamond mining, tender sales, and special stone recoveries.
• Firestone Diamonds: Operates the Liqhobong diamond mine in Lesotho, producing kimberlite diamonds. Direct geographic and operational peer given shared Lesotho jurisdiction and similar mining/tender sales model.
• Gem Diamonds: Operates the Letšeng mine in Lesotho, producing large, high-value rough diamonds. Highly comparable as a Lesotho-based kimberlite diamond miner focused on exceptional stone recoveries.
• Lucapa Diamond Company: Operates the Lulo alluvial diamond mine in Angola and Mothae mine in Lesotho, recovering large, high-value diamonds. Comparable as a Southern Africa-focused diamond producer with a portfolio of special, large stone recoveries.
• Letseng Diamonds: Operates the Letseng diamond mine in Lesotho, also renowned for producing exceptionally large, high-value diamonds. Direct comparable given shared Lesotho geography, kimberlite mining, and similar focus on large gem-quality stones.

Broad incumbents

• Alrosa: Russian state-owned diamond mining giant producing across multiple kimberlite and alluvial operations. Comparable diamond mining category but currently subject to sanctions that affect its market access; relevant for understanding global diamond supply dynamics.
• Namakwa Diamonds: Parent company and majority joint owner of SMD; broader diamond producer with operations across multiple geographies and across the diamond value chain. Comparable as the same corporate parent with overlapping management and marketing functions.
• De Beers Group: World's largest diamond miner by value across multiple kimberlite operations. Overlaps in end markets and sales channels but operates at much greater scale and across the broader diamond value chain.

Emerging players

• Tsodilo Resources: Exploration and development-stage diamond company with projects in Botswana and South Africa. Partial overlap in the kimberlite diamond mining value chain as a smaller, earlier-stage comparable.

Others

• Bonas Group: Diamond tender broker selling KAO production through Antwerp. Comparable as the channel partner and broader rough diamond tender broker servicing multiple producers; not a competitor but a key industry counterpart.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/storm-mountain-diamonds-pty-ltd

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 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 Storm Mountain Diamonds - Kao