SUSTAINABILITY

Environmental

Gem Diamonds is committed to responsible environmental stewardship, integrating disciplined environmental management into all aspects of our operations. We proactively identify, assess and manage environmental risks and impacts to minimise our footprint, strengthen operational resilience and contribute to sustainable outcomes in our host countries.

Related sustainability principles

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Improving resource use efficiencies

Prioritising environmental protection

Optimising socio-economic benefit

Related UN SDGs

The following UN SDGs relate to our environmental pillar:

Refer to our Annual Report and Accounts 2025 for more information on how environmental considerations and associated UN SDGs are integrated into our business operations.

Snapshot of our performance

• Zero major or significant environmental incidents for the 17th and 12th consecutive year, respectively
• 30% reduction in Scope 1 and 2 carbon emissions against our 30% decarbonisation target
• US$0.7 million invested in environmental protection in 2025 (2024: US$2.1 million)

• US$11.9 million environmental rehabilitation provision (2024: US$11.0 million)
• No environmental transgressions and no fines or non-compliance with host country legislation for the 16th consecutive year
• Total carbon footprint reduced 36% to 97 183 tCO₂e
  (2024: 103 215 tCO₂e)

Social

Maintaining our social licence to operate is fundamental to the Group's purpose: Produce the best diamonds, in the best way, leaving a lasting legacy.

As responsible operators and long-term partners in our host countries, we are committed to building and sustaining positive, transparent and constructive relationships with governments, employees, local communities and other stakeholders. We strengthen our social licence through continuous transparent engagement and open dialogue, ensuring that stakeholder perspectives inform our approach and that emerging issues are promptly and collaboratively addressed. Through this ongoing partnership-driven engagement, we aim to deliver mutually beneficial outcomes and support sustainable development in the regions in which we operate.

Related sustainability principles

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Prioritising environmental protection

Optimising socio-economic benefit

Prioritising the development and well-being of our employees

Related UN SDGs

Gem Diamonds' corporate social investment (CSI) strategy is informed by a needs analysis to identify socio-economic challenges. This is a collaborative process with PACs at our Lesotho operating mine, guided by the eight UN SDGs we have adopted.

The following SDGs relate to our social pillar:

Snapshot of our performance

• US$0.3 million invested in social projects
  (2024: US$0.3 million)
• US$33.5 million spent on local procurement
  (2024: US$38.8 million)
• Zero major or significant community incidents
  (2024: zero)

• Letšeng has awarded 55 scholarships to young Basotho citizens to date
• Zero incidents of compromised dam integrity
  (2024: zero)
• Zero violations of indigenous communities’ rights
  (2024: zero)

Employees

In our pursuit of zero harm, we prioritise a mature safety culture, support the physical and psychological well-being of our employees, and promote equality, diversity and professional development at every level. We are committed to fostering a workplace where employees feel supported, empowered and able to thrive.

Related sustainability principles

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Creating a safe and healthy working environment

Prioritising the development and well-being of our employees

Optimising socio-economic benefit

Related UN SDGs

The following UN SDGs relate to our employees pillar:

Refer to our Annual Report and Accounts 2025 for further details on employee engagement, remuneration matters and integration of UN SDGs into business operations.

Snapshot of our performance

• Zero fatalities
  (2024: zero)
• Letšeng retained ISO 45001 certification
  (Occupational Health and Safety Management)
• Lost time injury frequency rate (LTIFR): 0.14
  (2024: 0.18)

• 57 942 proactive safety management actions
  (2024: 55 128)
• Lowest recorded all injury frequency rate (AIFR): 0.41
  (2024: 0.61)
• US$25.2 million spent on employee remuneration and benefits
  (2024: US$32.9 million)

Governance and ethics

The value of our exceptional diamonds is shaped by the way we do business. Our commitment to respecting human rights, upholding ethical practices, and maintaining zero tolerance for bribery and corruption is embedded in strong governance. We continue to reinforce the highest ethical, legal and governance standards through well-established governance structures, supported by comprehensive policies, procedures and oversight mechanisms.

Related sustainability principles

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Creating a safe and healthy work environment

Prioritising the development and well-being of our employees

Optimising socio-economic benefit

Prioritising environmental protection

Related UN SDGs

The following UN SDGs relate to our governance and ethics pillar:

Refer to our Annual Report and Accounts 2025 for more information on our approach to integrating these UN SDGs into our business operations.

Snapshot of our performance

• Every recovered rough diamond is certified through the Kimberley Process
• Zero cases of bribery, corruption or anti-competitive behaviour (2024: zero)

• Zero breaches of confidentiality or customer privacy
  (2024: zero)
• One whistleblowing report
  (2024: seven)

Material matters

Implementing effective Board-approved ESG strategies

Our context

We are committed to aligning our ESG strategy with recognised best practice standards and evolving stakeholder expectations. The Board plays a central role in ensuring strong governance, ethical conduct and responsible decision-making across the Group. Leading by example, the Board provides oversight and direction in key areas, including:

• ESG strategy development, integration and implementation;
• risk management and mitigation;
• innovation and operational efficiency;
• CSI strategies;
• employee health, safety and well-being; and
• decarbonisation strategy, climate resilience and long-term targets.