International News
Emeralds announce spring’s arrival in Natasha Collis x Gemfields collaboration
Just in time for the start of Emerald Month in May – when green buds burst into life, lifting spirits – comes an exciting new collaboration from Gemfields. A world-leading responsible miner and marketer of coloured gemstones – and majority-owner and operator of the Kagem emerald mine in Zambia – Gemfields has joined forces with Ibiza-based jeweller Natasha Collis on two special collections designed to “bring joy to the everyday”. The Natasha Collis Fine Jewellery x Gemfields Ludic and Dancing Duet ranges showcase Gemfields’ Zambian emeralds offset against yellow gold in pieces that balance spontaneity and refinement. Inspired by the dualities of nature, they resound with the joys of spring. The four-piece Ludic collection consists of arresting 6cm drop earrings with oval, pear and round cut emeralds; a striking statement ring with an off-centre emerald; an open bangle with emerald pave; and a necklace with a chain of oval, pear and round emeralds.
Ludic is defined by its free-form shapes, a motif which also provides the design inspiration underpinning the Dancing Duet range. In this second collection, contrasting gold forms are placed two by two, creating an intimate duality of interconnected elements. The Dancing Duet range encompasses two necklaces, cascading Dancing Duet earrings, everyday studs and a beautifully flowing bracelet. Each of these features exquisite emeralds from the Kagem mine, set in sculpted 18k gold pieces, locked together in a graceful dance of playful opposition.

“My love for emeralds combined with Gemfields’ brand ethos inspired me to create this collaboration,” says Natasha Collis, who founded her eponymous fine jewellery brand in London before relocating in 2009 to Ibiza, where she now has a boutique and studio in the rugged North of the island and takes design inspiration from nature. A trained painter, Natasha switched her focus to jewellery design, experimenting with gold and different creations, and she has never looked back.
Her signature style highlights the raw beauty of gold: hand-crafting nuggets into organic shapes, with carefully selected asymmetric gemstones incorporated in a quirky and playful way. Natasha’s designs are, at once, wearable works of art and perfect for layering into every day. Gemfields believes those who mine gemstones should do so with transparency, legitimacy and integrity and that coloured gemstones should create a positive impact for the country and community from which they originate. Kagem – 75% owned by Gemfields in partnership with Zambian government – is believed to be the world’s single largest-producing emerald mine and has been the source of some of the most exceptional emeralds ever seen. “Natasha Collis’ organic, free-flowing designs take us to Ibiza! In these beautiful collections, Zambian emeralds provide pops of green and sparkle, effortlessly elevating a look and demonstrating the playful quality of coloured gemstones. Each emerald is a miracle of nature, having formed over 500 million years ago in the most unlikely of circumstances. Their rarity and unique characteristics set them apart, and make them the perfect choice for collections that are lively, and full of fun,” says Gemfields’ Marketing and Communications Director, Emily Dungey. With emerald the resplendent birthstone of May, it is timely to see Kagem’s treasures take pride of place in these one-of-a-kind designs by Natasha.
International News
Gemfields Reports Updated G-Factor Metrics, Highlights Government Revenue Contributions
10-year Data Underscores Fiscal Impact From Kagem and Montepuez Operations Amid Evolving Market Conditions
Gemfields has released its latest G-Factor for Natural Resources figures, offering an updated view of how its mining operations contribute to host government revenues. The data, announced on April 9, 2026 in London, covers the period up to December 31, 2025.
Over the 2016–2025 period, the company reported a G-Factor of 17% for its Kagem emerald mine in Zambia and 26% for Montepuez Ruby Mining in Mozambique. The G-Factor measures the share of revenue paid to governments through channels such as royalties, taxes, dividends, and other levies, offering a transparent benchmark of economic contribution.
Looking specifically at 2025, Montepuez Ruby Mining recorded a G-Factor of 23%, contributing $11.3 million to the Government of Mozambique on revenues of $49.9 million. Meanwhile, Kagem posted a lower 6% G-Factor, with $4.9 million paid to the Zambian government against revenues of $84.1 million.


The dip at Kagem was linked to operational disruptions, including a temporary suspension of mining between January and April 2025, as well as the impact of a 15% export tax on precious gemstones, which was later lifted in March 2025.
CEO Sean Gilbertson noted that the figures reflect varying operating and market conditions. While Montepuez saw lower premium ruby output, alongside a delayed auction and challenges such as illegal mining, its overall contribution ratio remained relatively stable.
Introduced in 2021, the G-Factor serves as a transparency tool for the natural resources sector, helping stakeholders assess how effectively resource extraction translates into public revenue.
Gemfields expects Kagem’s performance to move back toward its long-term average of around 18% as operations normalise and market dynamics improve. The company continues to advocate for wider industry adoption of the metric to enhance accountability and comparability across the sector.
The G-Factor for Natural Resources is expressed as a percentage and is calculated as:
Ap + Bp + Cp + Dp
—————————————
Ep
where:
· A = the total mineral royalty (tax on revenue) paid by the reporting company to the host
country government during the period
· B = the total corporation tax (tax on profit) paid by the reporting company to the host
country government during the period
· C = the dividends paid by the reporting company to the host country government during
the period (where the host country government is a shareholder in the reporting company)
· D = the total export taxes or export levies paid by the reporting company to the host
country government during the period
· E = the total revenues of the reporting company during the period
· p = the relevant period, typically calculated for each of (i) the prior year; (ii) the preceding
5 years and (iii) the preceding 10 years
· The sums actually paid during the period (rather than the sums accrued or falling due during
the period) are used for A, B, C, and D.
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