Artisanal and small-scale mining (ASM) refers to mining activity conducted by individuals, family groups, or informal cooperatives using low levels of mechanisation, limited capital investment, and largely manual techniques. The World Bank estimates that ASM employs more than 40 million people directly worldwide, with a further 150 million or more dependent on it for their livelihoods. Within the coloured-gemstone sector specifically, ASM is not a marginal phenomenon: it is the dominant mode of production. The overwhelming majority of rubies, sapphires, emeralds, alexandrites, spinels, and tourmalines that enter international trade were extracted not by industrial mining corporations but by small teams working with hand tools, rudimentary sluices, and generations of accumulated local knowledge. Understanding ASM — its economics, its hazards, its social fabric, and the certification frameworks attempting to reform it — is therefore inseparable from understanding the gemstone trade itself.

Defining ASM: Scale, Informality, and Spectrum

The term encompasses a wide spectrum of operations. At one extreme is the lone prospector panning a river gravel for sapphires in Madagascar's Ilakaka region; at the other, a cooperative of several hundred miners working an organised pit in Colombia's Boyacá emerald belt. What unites them is the absence of heavy industrial infrastructure — no open-cut draglines, no cyanide heap-leach pads, no corporate balance sheets. Mechanisation, where it exists, tends to be limited to small pumps for dewatering, compressors for pneumatic tools, or rudimentary washing plants.

Informality is the other defining characteristic. Many ASM operations lack formal mining licences, operate on land whose tenure is disputed or unclear, and exist in a legal grey zone that varies enormously by jurisdiction. In some countries — Tanzania, for instance — the state has created specific licensing categories for small-scale miners. In others, entire mining communities operate entirely outside any regulatory framework, rendering their output technically illegal even when it is destined for the most prestigious jewellery houses in the world.

The distinction between "artisanal" and "small-scale" is sometimes drawn formally: artisanal mining typically implies individual or family-level subsistence activity, while small-scale mining implies a slightly more organised enterprise with modest capital. In practice the two categories blur continuously, and international bodies including the World Bank and the United Nations Environment Programme (UNEP) generally treat them together under the ASM umbrella.

Geographic Footprint in the Gemstone World

ASM gemstone production is concentrated in a band of geologically rich but economically developing nations across sub-Saharan Africa, South and Southeast Asia, and Latin America. Key localities illustrate the breadth of the phenomenon:

• Myanmar (Burma): The Mogok Stone Tract, source of the world's most celebrated rubies and spinels, has been worked by artisanal miners for centuries. Even under periods of state control, informal digging has continued alongside licensed operations. The Mong Hsu ruby fields and the Hpakant jade mines similarly depend on large artisanal workforces.
• Colombia: The Muzo, Coscuez, and Chivor mines, legendary sources of the finest emeralds, have historically involved complex arrangements between large landholders and thousands of independent guaqueros — informal diggers working tailings and peripheral ground.
• Madagascar: The sapphire rush at Ilakaka beginning in 1998 brought tens of thousands of artisanal miners to a remote semi-arid region within months, creating one of the most dramatic examples of spontaneous ASM in modern gemstone history. Similar rushes have occurred at Andilamena (ruby) and Ambatondrazaka.
• Tanzania: The Umba Valley, Tunduru, Songea, and — most famously — the Merelani tanzanite mines all rely substantially on small-scale miners, even where larger companies hold concessions.
• Sri Lanka: The gem gravels of the Ratnapura district have been worked by artisanal methods for at least two millennia, producing sapphires, chrysoberyl, spinel, and a wide range of other species through shallow pit and river-gravel mining.
• Afghanistan: The Panjshir Valley emerald deposits and the ancient lapis lazuli mines of Badakhshan province are worked almost entirely by artisanal methods under conditions of considerable political and physical insecurity.
• Brazil: The gem-rich pegmatite fields of Minas Gerais, Bahia, and Pará produce tourmaline, aquamarine, alexandrite, and topaz through a mixture of small-scale licensed operations and informal digging known locally as garimpo.

Gold ASM, while outside the strict scope of a gemstone encyclopaedia, is deeply intertwined with coloured-stone mining in many regions: the same communities, the same regulatory failures, and the same certification debates apply across both sectors.

Working Conditions and Occupational Hazards

The physical conditions of ASM are frequently severe. Underground workings are often unsupported or inadequately timbered, creating acute risk of collapse. Flooding is a persistent hazard in alluvial operations, particularly during seasonal rains. Dust exposure in dry-processing environments raises the spectre of silicosis. Injuries from hand tools, falling rock, and improvised explosives are common, and access to medical care in remote mining areas is typically limited.

In gold ASM specifically, the use of elemental mercury to amalgamate gold from ore represents one of the most serious documented environmental and public-health crises associated with the sector. Mercury vapour released during amalgam burning causes irreversible neurological damage; mercury discharged into waterways bioaccumulates through aquatic food chains. The Minamata Convention on Mercury, which entered into force in 2017, specifically addresses ASM gold processing and obligates signatory states to develop national action plans to reduce and, where feasible, eliminate mercury use. Coloured-gemstone ASM does not involve mercury in ore processing, but gemstone miners in multi-commodity regions may live in communities where mercury contamination from adjacent gold workings is a real hazard.

Child labour is a documented problem in parts of the ASM gemstone sector. Research by organisations including the International Labour Organization (ILO) has identified child participation in mining in parts of sub-Saharan Africa and Asia, ranging from surface sorting and carrying to underground work. The causes are structural: extreme poverty, lack of accessible schooling, and the family-based organisation of many artisanal operations. Responsible sourcing frameworks increasingly require supply-chain due diligence specifically addressing child labour risk.

Economic and Social Dimensions

Despite its hazards and informality, ASM performs vital economic functions that are frequently underestimated in policy discussions dominated by industrial-mining interests. In many remote regions, ASM is the primary — sometimes the only — source of cash income. It supports not only miners but also traders, transporters, food vendors, equipment suppliers, and a wide range of ancillary service providers. The economic multiplier effect of a functioning ASM community can be substantial in areas where agricultural productivity is limited.

The gemstone value chain from ASM source to retail consumer is typically long and opaque. A ruby extracted by an artisanal miner in Mogok may pass through a local broker, a Mandalay dealer, a Bangkok cutting house, a Hong Kong wholesaler, and a New York or Geneva retailer before reaching its final buyer. At each step, value is added — but the proportion of final retail value captured by the original miner is generally very small. Studies of various ASM gemstone supply chains suggest that miners frequently receive between one and ten per cent of the eventual retail price, though this varies enormously by stone type, quality, and the degree of market access the miner can achieve.

This asymmetry is not simply a matter of exploitation: it reflects the genuine costs of cutting, grading, certification, marketing, and retail infrastructure. Nevertheless, it underscores why certification and direct-trade initiatives that improve miners' market access and bargaining power can have meaningful impact on livelihoods even when they affect only a modest share of total production.

Formalisation: Challenges and Approaches

Formalisation — the process of bringing ASM operations within legal, regulatory, and fiscal frameworks — is widely regarded by development economists and mining-sector specialists as a prerequisite for sustained improvement in ASM conditions. Formalised miners can access credit, legal protection, health and safety oversight, and certification schemes. They contribute to state revenues through taxes and royalties. Their production can be traced through documented supply chains.

In practice, formalisation is extraordinarily difficult. Licensing processes in many jurisdictions are complex, expensive, and require literacy and bureaucratic access that many artisanal miners lack. Corruption in licensing authorities is a documented obstacle. Land tenure uncertainty — a particular problem in post-conflict states and in regions where customary land rights are unrecognised by formal law — makes it impossible to obtain a mining licence over ground to which legal title is itself contested. And the economic logic of informality is powerful: formal status brings costs (fees, taxes, compliance obligations) that may outweigh the benefits for a miner operating at subsistence level.

Progressive approaches to formalisation recognise these barriers and attempt to lower them: simplified licensing for small operators, mobile registration services, community-based licensing models, and graduated compliance requirements that allow miners to improve conditions incrementally rather than demanding full compliance as a precondition for any legal recognition.

Certification Frameworks: Fairmined, Fairtrade Gold, and Beyond

The most developed certification frameworks for ASM originate in the gold sector but have informed thinking about coloured-gemstone traceability more broadly. The Alliance for Responsible Mining (ARM), a Colombia-based non-governmental organisation, developed the Fairmined standard, which certifies ASM gold and associated silver and platinum-group metals from operations that meet defined criteria relating to environmental management, occupational health and safety, prohibition of child and forced labour, and organisational governance. Certified operations receive a price premium above the London Metal Exchange spot price, providing a direct economic incentive for compliance.

Fairtrade Gold, administered by Fairtrade International, operates on similar principles and is particularly active in certifying operations in East Africa, South America, and South Asia. Both standards require third-party auditing and maintain public registries of certified mines.

For coloured gemstones, no single certification standard has achieved the market penetration of Fairmined or Fairtrade Gold, but several initiatives are noteworthy. The Responsible Jewellery Council (RJC) operates a chain-of-custody certification that can extend back to mining operations, though its primary focus has historically been on the midstream and retail sectors. The Columbia Gem House and a number of other specialist dealers have developed proprietary direct-trade programmes with specific ASM communities. The Gemfields model — large-scale, formally structured mining with community benefit agreements — represents a different approach to the same underlying challenge of ensuring that gemstone extraction benefits local communities.

Traceability technology is increasingly deployed in support of certification: blockchain-based provenance records, QR-code tracking systems, and isotopic and inclusion-fingerprinting techniques (the latter pioneered in part through research published in Gems & Gemology) all contribute to the ability to document a stone's journey from pit to polished gem. None of these technologies is a complete solution — they are only as reliable as the data entered at the point of origin — but they represent meaningful progress.

The Coloured-Gemstone Trade's Particular Relationship with ASM

Unlike diamonds, which are dominated by a small number of large industrial producers and have been subject to the Kimberley Process Certification Scheme since 2003, coloured gemstones are produced overwhelmingly by ASM operations and have no equivalent international certification framework. The Kimberley Process itself is explicitly limited to rough diamonds and does not address coloured stones.

This means that the coloured-gemstone trade's relationship with ASM is both more intimate and less regulated than the diamond trade's. A ruby or sapphire dealer who wishes to source responsibly must essentially construct their own due-diligence framework, drawing on a combination of personal relationships with trusted suppliers, independent laboratory origin reports (from institutions such as Gübelin, SSEF, GIA, or Lotus Gemology), and their own assessment of conditions at source localities they may have visited personally. The most respected dealers in the coloured-stone world have long maintained direct relationships with mining communities — a practice that predates the modern responsible-sourcing movement by generations and that remains the most effective single mechanism for ensuring that ASM miners receive fair value and work in acceptable conditions.

The growing consumer demand for supply-chain transparency — particularly among younger buyers — is creating commercial incentives for the trade to invest more systematically in ASM due diligence. Auction houses including Sotheby's and Christie's now routinely include provenance and sourcing commentary in catalogue notes for significant coloured stones. Major jewellery brands have made public commitments to responsible sourcing. These market signals, while imperfect, are beginning to flow back through the supply chain in ways that reward miners and dealers who can document their practices.

Looking Forward

ASM will remain the foundation of the coloured-gemstone trade for the foreseeable future. The geological reality is that the world's finest ruby, sapphire, emerald, and spinel deposits occur in geologically complex, geographically remote, and often politically fragile environments where large-scale industrial mining is rarely viable. The human reality is that tens of millions of people depend on ASM for their survival and that any responsible engagement with gemstones must grapple honestly with that fact.

The trajectory of reform is positive but slow. Formalisation is advancing in some jurisdictions. Certification schemes are maturing. Traceability technology is improving. Consumer awareness is growing. The gap between the conditions under which most gemstones are extracted and the aspirations of the responsible-sourcing movement remains wide — but it is narrowing, and the coloured-gemstone trade, at its best, has always understood that the human story behind a stone is inseparable from its beauty.

Further Reading

• GIA Gems & Gemology — Artisanal Mining and Gemstones (Fall 2019)
• Responsible Jewellery Council — Standards
• Alliance for Responsible Mining — Fairmined Standard
• Fairtrade International — Fairtrade Gold
• UNEP — Artisanal and Small-Scale Gold Mining and Mercury