Gemfields Group Limited
Gemfields Group Limited is a coloured-gemstone miner and marketer, 75% owner and operator of both Kagem Mining Limited in Zambia (believed to be the world's single largest producing emerald mine) and Montepuez Ruby Mining (MRM) in Mozambique (one of the most significant ruby deposits found in recent decades). Value is realized primarily through periodic gemstone auctions rather than continuous production sales -- H1 2026 auction revenue was $102.9 million, up from $60 million in H1 2025. MRM has faced real operational headwinds in 2026: weak premium-grade ruby recovery (0.025 carats/tonne in H1 2026), security disruption, illegal mining activity, and delayed Mozambique VAT receipts; a second MRM processing plant is expected to be fully commissioned later in 2026. CEO Sean Gilbertson stepped down by mutual agreement effective 15 Jul 2026 after an 8-year tenure; CFO David Lovett is serving as interim CEO while the board searches for a permanent successor, under chairman Bruce Cleaver. The company sold its Faberge luxury-jewellery subsidiary for $50 million in Aug 2025 and completed a $30 million rights issue in Jun 2025 to strengthen the balance sheet.
Notable vs. Peers
- Financials score of 1/10 is weaker than the peer average of 6.1/10.
- Jurisdiction risk score of 5/10 is meaningfully riskier than the peer average of 7.7/10.
Lifecycle Milestones
Construction Milestones
5 of 5 reached- Reached — date not disclosed · Source
- Feb 2012 · Source
- Reached — date not disclosed · Source
- Reached — date not disclosed · Source
- Reached — date not disclosed · Source
Milestones are recorded only from a company's own dated disclosure. A milestone with no date shown is one we can confirm was reached but for which no date was disclosed — we don't estimate one. "Not yet reached" means exactly that, not that a date is missing. An "Expected" line likewise only ever reflects the company's own guidance (e.g. a study or permit decision targeted for a stated quarter) — most not-yet-reached milestones have none, and that absence means no such guidance has been disclosed, not that one is overdue.
Not yet determined: grid power.
Not yet determined: grid power.
Combined view across 2 projects. Figures below are only combined where the underlying basis genuinely matches -- see the notes under each.
- 25 yrsKagem Emerald Mine
- 21 yrsMontepuez Ruby Mine
Jurisdiction (40%)5/10
A two-country operator: Zambia (Kagem emerald mine) is a relatively stable, established African mining jurisdiction; Mozambique (Montepuez Ruby Mining) carries real, current operational risk -- the company's own Jul 2026 leadership-transition coverage cites 'security-related disruption, illegal mining activity and delayed VAT receipts' in Mozambique specifically. This single-country field reflects Zambia, the more stable of the two -- see description for the Mozambique-specific caveat.
Infrastructure (40%)8.6/10
A confirmed mill, confirmed road access, and a confirmed tailings facility at Kagem Emerald Mine; grid power not yet researched, counted at a neutral 5/10 until established.
Nearby producing mine (20%)Not yet researched
No project coordinates on file yet, so distance to a producing mine can't be measured.
Acquisition Susceptibility
A relative ranking of how closely this company matches the profile of juniors that have actually been acquired — not a probability, and not a reason to buy. Acquisitions are rare: only a few dozen significant deals happen a year across a universe of thousands of juniors, so even a high score here describes a long shot. The strongest signal in the research, a producer that already owns part of the company, is scored from its disclosed strategic shareholders. A producer that is a joint-venture or earn-in partner on the project, rather than a shareholder, isn't captured yet.
How this score is built
- Disclosed pending dealSub-score: Not scored
No pending acquisition or merger disclosed (checked)
Not scored: having no deal in flight isn't held against a company.
Weight 26.25% - Producer's strategic stakeSub-score: Not scored
No producer stake on file; largest strategic holder is Assore International Holdings Limited (32.85%) See holders
Not an operating producer, so it isn't the toehold-then-takeout pattern the research documents; a missing producer stake isn't held against a company.
Weight 25% - Distance to a producing mineSub-score: Not yet researched
Distance not yet researched: no project coordinates on file
Distance can't be measured without coordinates, so excluded rather than counted as far.
Weight 22.5% - Lifecycle stageSub-score:5.5/10
Stage: Production
Feasibility and permitting score 10, where deals cluster, and production 5.5; earlier stages score less, down to 1 at grassroots.
Weight 15% · 57% here - JurisdictionSub-score:5/10
Zambia: jurisdiction score 5/10
Our jurisdiction score, used as is: higher means lower political and permitting risk.
Weight 6.75% · 26% here - CommoditySub-score:2/10
Primary commodity: Other
Gold 10, copper 8, silver 5, nickel and uranium 4, others 2: most majors' deals are for gold.
Weight 4.5% · 17% here
Weight is each input's share of the full score. “Here” is its share of this company's score: inputs that aren't scored are left out and the rest re-weighted, never counted as zero.
Your Rankings
Management Team
Chief Financial Officer of Gemfields Group Limited.
Chairman and independent non-executive director of Gemfields Group Limited since 1 July 2024. Former CEO of De Beers Group, 2016 to early 2023, then co-chair for approximately one further year; a director of De Beers from 2008, responsible at different times for exploration, strategy, corporate affairs and commercial matters. During his CEO tenure, De Beers improved its safety record, brought several new mines onstream, made sustainability a core part of the business, launched the Lightbox lab-grown-diamond brand, and created the first fully distributed diamond blockchain (Tracr).
Non-Independent, Non-Executive Director of Gemfields Group Limited since 11 October 2021. Joined the Assore group in 2003; Chairman of Assmang Ltd since 1 January 2023; Managing Director of, and holds a beneficial interest in, Assore International Holdings Limited (AIHL).
Non-Executive Director of Gemfields Group Limited since 1 July 2024, having served as Permanent Alternate Director to Patrick Sacco from November 2021. BSc Mining Engineering (Camborne School of Mines, 1991), MBA (Wits Business School, 2001); 10+ years in investment banking/equity research at UBS, Macquarie and Investec before joining Assore Ltd in 2018.
Non-Executive Director of Gemfields Group Limited since 25 June 2025. Qualified as an attorney of the High Court of South Africa in 1997; joined Steinhoff International as General Counsel in 2017, appointed Group CEO effective 1 January 2019, and continues as Group CEO of Ibex Holdings (Steinhoff's successor entity).
Lead Independent Non-Executive Director of Gemfields Group Limited since 31 May 2019. 20+ years across South Africa's public and private sectors, including the Constitutional Assembly during the drafting of South Africa's post-apartheid Constitution and the Land Claims Commission; director of Sedibelo Platinum Mines Limited for almost ten years.
Independent Non-Executive Director of Gemfields Group Limited since 1 December 2020.
Independent Non-Executive Director of Gemfields Group Limited since 1 July 2024. Serves on the Audit and Nomination Committees and chairs the Risk Council.
Insiders, Investors & Smart Money
Notable shareholders and insiders whose involvement is worth knowing about, plus what we're seeing from institutional/large-investor activity.
Assore has built its long-standing strategic position in Gemfields to 32.8% (566,357,695 shares via Assore International Holdings Limited, as of a 16 Jan 2026 disclosure). Institutions separately hold about 35% of the register, and director Patrick Sacco bought roughly R38 million of stock in the past year.
No notable insiders tracked for this miner yet.
Reports, Presentations & Documents
Gemfields is a coloured-gemstone miner and marketer that owns and operates 75% of the Kagem emerald mine in Zambia, which it believes is the world's largest producing emerald mine, with the Zambian government holding the rest, and 75% of Montepuez Ruby Mining in Mozambique, one of the most significant ruby deposits found in recent decades. It sells mainly through periodic auctions, and auction revenue in the first half of 2026 was US$102.9M, up from US$60.0M a year earlier. Montepuez faced headwinds in 2026, including weak premium-grade ruby recovery of 0.025 carats per tonne in the first half and security disruption, while its second processing plant is expected to be fully commissioned later in 2026. Kagem's reserves support a 25-year life of mine and Montepuez's a 21-year life of mine, with resources and reserves reported in carats.