NOVEMBER 2, 2022

Kagem unveils colossal 37kg cluster of emeralds

LUFWANYAMA, ZAMBIA – Lufwanyama-based Kagem Mining continued to put Zambia’s gemstones at the forefront of world demand this week as it unveiled a giant 37kg cluster of emeralds.

The team’s find – named the Kafubu Cluster –  is expected to be the most expensive single emerald piece ever sold by the company when it comes up for auction this month, generating foreign exchange for the nation as proceeds are repatriated to Zambia.

Geologists at Kagem have “freed the emerald crystals from their host rock.” The result is a large mass, filled with numerous individual and intertwined emerald crystals, displaying their perfect hexagonal structure.

Kagem Assistant Sort House Manager Jackson Mtonga, who has 28 years of experience of emerald discoveries at Kagem, paid testimony to the incredible nature of this find: “Rarity is one of the factors that makes emeralds hold such a special value in many cultures around the world, but the combination of this crystal cluster formation, the overall quality and the sheer enormity of the Kafubu Cluster is something I never thought possible.”

The Kafubu Cluster displays all the desired characteristics that an emerald should possess: a vivid green colour overall that glows and shines. It offers different levels of perfect crystallisation, to allow the future cutter to create a collection of gems, from fine quality faceting material to cabochons and beads for everyday fun. It is possible that a customer may decide to preserve this in its natural form or cut the piece to yield tens of thousands of carats of commercial to fine quality cut emeralds.

The Kafubu Cluster is being offered for sale by Kagem’s parent company Gemfields at its upcoming emerald auction in Bangkok, with bidding closing on 17 November 2022. Given its size and quality, it is likely that the Kafubu Cluster will be the most expensive single emerald piece ever sold by Gemfields.

The Kafubu Cluster was discovered in the Chama pit of the Kagem emerald mine, based in Lufwanyama in Zambia. Kafubu is a river which forms the natural boundary of Kagem in the southern part of the Kagem licence, and it is from this that the Kafubu Cluster takes its name – honouring the unique landscape in which it was formed. Kagem is believed to be the world’s single largest producing emerald mine; it is 75% owned by Gemfields, in a model partnership with the Zambian government.

Discovered in March 2020, the Kafubu Cluster is a colossal cluster of emeralds. Close inspection of the 37,555-gram (187,775 carat) cluster reveals that it contains very little matrix or other minerals, meaning the piece is almost entirely made up of emeralds, which, given its sheer size and formation, makes this a very rare find indeed.

The Kafubu Cluster is a testament to the high-quality gemstones that can be produced when Mother Nature allows time for the various crystals to form deep within the Earth’s crust. Gemfields’ geologists describe the formation process of emeralds as an incredibly rare coming together of uncommon elements in unusual circumstances.

A precise set of remarkable geological and geochemical conditions is required for the formation of these brilliant green gems. Beryllium, essential for the crystallisation of beryl, is one of the most elusive elements in the Earth’s crust (estimated to be about 2 parts per million) and must be carried up to the surface by pegmatites, which, in turn, must come into contact with chromium and vanadium-bearing (ultramafic) rocks in order to attain the desired colour. Not all pegmatites are beryllium-bearing and even fewer are emplaced within rocks that contain adequate chromium. These factors – coupled with even more specific temperature, pressure and fluid content requirements for its formation – makes emerald extremely rare and remarkably erratic in its distribution.

Zambian emeralds tend to have a higher iron content than emeralds from other origins, which means they are less fragile. High iron content also means fewer surface-reaching fractures and less need for treatments and enhancements. The careful process of recovering emeralds by hand at the Kagem emerald mine has enabled the safe recovery of some of the largest and most exceptional emeralds ever found, of which the Kafubu Cluster is an extraordinary example.

The naming of uncut emeralds is a tradition reserved only for the rarest and most remarkable gems. While no official record exists, it is thought that no more than two dozen gemstones have ever been given their own name, and it is extremely unusual to encounter a gemstone weighing more than 1,000 carats. Unlike Insofu (elephant), Inkalamu (lion) and Chipembele (rhino), the Kafubu Cluster is not one single crystal and is completely unique in character.


High resolution imagery can be downloaded here:

Gillian Langmead
Langmead & Baker Ltd
Tel: +260 979 060705

Head office
Helena Choudhury
Head of PR and Communications
Tel: +44 (0)207 518 3420

Kagem responsible sourcing highlights

  • Kagem is committed to ensuring that the community continues to benefit positively from its operations through various sustainability programmes focused on alleviating poverty and aligned with government policies, the UN Sustainable Development Goals (SDGs) and Vision 2030
  • The mine has spent more than USD 2.8 million on community projects, including:
    • Rehabilitation of the 18.7km road connecting Chief Nkana and Chief Lumpuma’s chiefdoms from Kandole to Kafwaya village in Lufwanyama district
    • Construction of the Nkana Health Centre
    • Construction and equipping of a new Chapula Secondary School
    • Construction of new buildings at Chapula Primary School
    • Building of teachers’ accommodation at Kapila Community School
    • Support for the Blessing, Kapila Green Farms, Twende and Twasanta projects
    • Improvements to Chief Nkana and Chief Lumpuma’s palaces
  • Kagem has renewed its partnership with both the Copperbelt University (CBU) and the University of Zambia (UNZA), committing to new scholarship programmes totalling USD 345,000. This follows the previous commitment of USD 345,000 to sponsor students from the geological and mining engineering departments at the School of Mines at UNZA and CBU over a period of eight years.
  • Kagem has pledged USD 220,000 to support the Lumpuma Multi-Purpose Cooperative Society farming initiative.
  • Kagem currently provides 1,150 direct jobs, with 94% of the workforce being local.

About Kagem Mining
Kagem Mining Ltd, based in Lufwanyama, is believed to be the world’s single largest producing emerald mine. Kagem is 75% owned by Gemfields, in a model partnership with the Zambian government.
Kagem aims to emulate the values of Gemfields and operate in a way that contributes positively to the national economy, while taking a leading role in modernising the coloured gemstone sector and building sustainable livelihoods for the communities around the mine. Kagem believes that coloured gemstones should be mined and marketed by championing three key values – transparency, legitimacy and integrity.
Gemfields is a world-leading miner of responsible coloured gemstones. In addition to Kagem, Gemfields is the operator and 75% owner of Montepuez Ruby Mining in Mozambique (at one of the most significant recently discovered ruby deposits in the world), as well as bulk sampling licences in Ethiopia, amongst others. 
Gemfields has developed a proprietary grading system and a pioneering auction and trading platform to provide a consistent supply of coloured gemstones to the global jewellery market.
Fabergé – an iconic name with an exceptional heritage – is a member of the Gemfields Group. The beauty of Fabergé’s designs and craftsmanship, helps to raise consumer awareness of responsibly sourced coloured gemstones.
As well as supplying a significant share of the world’s rough rubies and emeralds, Gemfields initiates activations to build desire for coloured gemstones: for example, collaborations with international jewellery brands and other creative partners. Often surprising, unexpected and unique, these collaborations are chosen to promote consumer awareness and increase the appeal of coloured gemstones, raising their profile, and, in turn, providing greater benefit to their place of origin in Africa.

Gemfields: | Investors | Instagram | Facebook | Twitter | YouTube
Fabergé: Fabergé.com | Instagram | Facebook | Twitter | YouTube
Kagem Mining: LinkedIn
Montepuez Ruby Mining: LinkedIn

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