Sri Lanka: From Mine to Market, Part 1

Andrew Lucas, Armil Sammoon, A. P. Jayarajah, Tao Hsu, Pedro Padua
September 30, 2014
Traditional Practices in Sri Lanka
Sri Lanka’s gemstone and jewelry industry blends traditional practices and experience with the needs of the modern global market. Photo by Andrew Lucas/GIA.
To visit Sri Lanka is to experience one of the great gem sources and trading centers in the world. This country has a rich, almost unparalleled tradition and remains vitally important to the modern gemstone market. Sri Lanka has a true mine-to-market industry, both domestically and for export. Its evolution over the last two decades blends the best of traditional practices with modern technologies and business models.

In this field report, we take you on an expedition to this magnificent island and its remarkable mine-to-market industry.

Cat’s-Eye Chrysoberyl from Sri Lanka
Sri Lanka has produced a wide variety of gemstones, including cat’s-eye chrysoberyl. Photo by Andrew Lucas/GIA.

An Amazing Island

Traveling in Sri Lanka, you realize it is a large island with very diverse environments. Most of the terrain consists of flat or rolling hills, but there are beautiful mountains in the southern central interior. Agriculture is a constant presence as you drive around the country, with intense green rice fields and rubber tree plantations.

In Elahera’s rice fields, there are treehouses for agricultural workers to climb into when a herd of wild elephants passes through. In Ratnapura, Elahera, and Balangoda, green rice fields also enclose small pit-mining operations, sometimes covered with V-shaped roofs for a little protection from rain and sun. Gaining elevation, you encounter beautiful tea plantations where it is common to see workers picking tea leaves by hand. Driving along the coast offers views of Sri Lanka’s beautiful coastline and fishing industry.

Green Fields
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Island Images
Sri Lanka has two monsoon seasons that occur at different times of the year depending on the part of the country. The northeast has monsoons from December through March. In the southwest, where most of the mining takes place, the monsoon season lasts from June to October. As in many places throughout the world, weather patterns in recent years have not been as predictable as they were in the past. We encountered mostly good weather, but intermittent rainstorms occurred regularly, interrupting mining operations.

History, Culture, and People

It is believed that Sri Lanka has been inhabited by humans for more than 300,000 years. The main ethnic group is the Sinhalese, representing about 73 percent of the population. They arrived from India in about the late sixth century BC. Buddhism came to Sri Lanka around the third century BC, and today it is the main religion of the Sinhalese people and the island. The Tamil people, from the Tamil area of India, are primarily Hindu. There is also an important Muslim and Christian population, leading to a rich diversity that is reflected in domestic jewelry design preferences, especially for weddings.

Sri Lanka's rich cultural heritage has become a major tourist attraction as visitors seek to learn more about this island and its people, which in turn has stimulated the economy. One of the cultural heritage sights we visited as we traveled to gem mining areas was Sigiriya, a UNESCO World Heritage site. 

At the Top
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Sigiriya Images

Experiencing Sigirya

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Tradition, Experience, and Modernization: The Best of All Worlds

In documenting Sri Lanka’s entire mine-to-market industry, one of the most fascinating aspects is the harmonious and productive blend of tradition, experience, and modernization. This was apparent in the mining, trading, cutting, treatment, jewelry manufacturing, and retail sectors. Mining is done primarily by traditional methods, and it is small-scale by choice and design. Cutting is a fascinating blend of hand-powered techniques, utilizing some of the world’s greatest expertise in orientation of rough, and a growing precision cutting and recutting industry that maintains the strictest tolerances.

Cutting
Cutting in Sri Lanka often relies on decades of experience rather than sophisticated or automated techniques. Photo by Andrew Lucas/GIA.
The trading sector combines knowledge and experience acquired over decades, if not centuries, with modern global business models. Just as mastering sapphire heat treatment helped the Thais become dominant players in the global corundum market, the Sri Lankans have great expertise in getting the best yield and color out of sapphire.

Jewelry design and manufacturing is directly tied to the domestic retail market as well as the market for Sri Lankans living abroad. Traditional 22K gold jewelry is in high demand for weddings as well as for investments and as a financial asset to pawn in times of need. At the same time, the market has adjusted to a younger generation with more varied tastes, while aiming to increase tourist purchases and broaden export markets.

Pits, Mud, Gravel, and Gemstones

Gemstone mining in Sri Lanka is mostly from secondary deposits. The gravels yield sapphire, ruby, cat’s-eye and other chrysoberyls, spinel, garnet, beryl, tourmaline, topaz, quartz, and many other gemstones. Sri Lanka’s gem-bearing gravels, called illam, are some of the richest in the world. The island was blessed with geological conditions that provide an ideal blend of chemistry, heat, pressure, time for gem crystals to grow, and weathering for the gem crystals to be deposited and concentrated in gravels.

Illam
Gemstone deposits in Sri Lanka contain gem-bearing gravels called illam. Photo by Andrew Lucas/GIA.
Besides the well-known Pangaea, which existed about 300 million years ago, there were several other supercontinents in Earth’s early history. Their assembly and breakup cycles helped form most of the world’s gem deposits. Some of these cycles are directly related to gem formation in Sri Lanka.

Assembly of the Gondwana supercontinent was a slow process that took place over millions of years, between 550 and 950 million years ago (Ma), when global forces led to large-scale structural changes in the earth’s crust and upper mantle. The resulting collisions formed the Mozambique Belt, which extends from Mozambique to Ethiopia and Sudan, and also covers most of Madagascar, the southern tip of India, Sri Lanka, and the east coast of Antarctica. Sri Lanka occupied a critical area of Gondwana, and many of its gemstones are believed to have formed between 539 and 608 Ma, a time of peak metamorphism for the area.

Most of the gem deposits are in an area called the Highland Complex, extending northeast to southwest and containing high-grade metamorphic rocks. One major primary sapphire deposit was discovered by accident in 2012 near Kataragama, but it was not producing at the time of our visit, and subsequent mining of the area has produced no commercial yields. A full geological study of the deposit has not been performed, however, so the true potential of this area remains unknown.

Map of gem deposit areas in Sri Lanka
The Highland Complex of Sri Lanka is the most important area for formation of
gemstone deposits. Illustration by Peter Johnston, © GIA.

Sri Lanka’s commercially important colored gemstone deposits come from weathered alluvial gravels. We visited the mining areas around Ratnapura, Balangoda, and Elahera. Although these make up only a small percentage of the island’s gem deposits, they gave us a representative overview of mining operations throughout the country. All of these were secondary gravel deposits. We did not find any active primary deposits at the time of our visit.

Sri Lankan Gemstone Mining
The mining operations we visited represented all three types of Sri Lankan gemstone mining: pit, mechanized, and, in this case, river. Photo by Andrew Lucas/GIA.

Mining

Mining licenses in Sri Lanka are regulated by the National Gem and Jewellery Authority (NGJA). Of the more than 6,500 licenses issued in 2013, more than 6,000 were for pit-mining operations using traditional methods. The remainder went to river and mechanized mining. Licensing for mechanized mining follows very strict guidelines, and only about ten were issued in 2013.

Open Pits
Most of the gemstone mining in Sri Lanka done by hand in open pits. At this larger pit,
miners toss up the gravel in baskets. Photo by Andrew Lucas/GIA.
Many of the trade and regulatory bodies in Sri Lanka are against large-scale gemstone mining. They consider traditional small-scale mines less harmful to the environment and a more stable source of employment for more people.

To give an idea of scale, the standard pit mine in Sri Lanka consists of a vertical shaft that measures two by four meters. If the pits are deep and in harder ground, the miners might dig a two by two meter square pit or a two-meter round pit. Depth can range up to 50 meters, though most pits are between 5 and 25 meters.

Vertical Shafts
Most pit-mining operations in Sri Lanka are relatively small vertical shafts. Mining relies
on muscle power, not mechanization. Photo by Andrew Lucas/GIA.
Many of the licensees have four to five traditional mining pits on their property. It’s estimated that more than two million pits have been dug over the last 50 years. Compared to gem mining in many African countries, there are hardly any unfilled, abandoned pits. This is partly because the National Gem and Jewellery Authority (NGJA) collects a cash deposit when a license is issued. If the mine owner does not rehabilitate the land after mining is complete, the NGJA uses the deposit money for that purpose.

There are usually several people involved in the venture, including the landowner, the holder of the mining rights, the person who supplies the water pump to remove water from the pit, and the miners. They all receive a share of the proceeds from the sale of the gemstones.

Although not as prominent, river mining is another traditional form of gem mining in Sri Lanka. Rivers in gem-producing areas can contain alluvial deposits where the river bends or otherwise slows down. The river miners pick these slow-moving areas in relatively shallow waters and build a dam of wood or rock where the water slows, allowing it to escape from one side while trapping the gravels.

Gem Mining
Mechanized gem mining is very limited in Sri Lanka. Photo by Andrew Lucas/GIA.
Using metal blades attached perpendicularly to long wooden poles called mammoties, the miners scoop up the gravel and remove the overburden until they reach the illam. Then they use long pointed steel rods to loosen the illam and drag it up, allowing the rushing water to wash the gem-bearing gravel. They remove any visible gemstones, and the remaining gravel can undergo further washing.

Mechanized mining occurs when it’s determined that traditional methods won’t apply to the deposit at hand, if the concentration of gems is too low for pit mining, or if the threat of illegal mining activity requires quick mining of the deposit. There are a limited number of mechanized operations, and the requirements are stringent.

Cutting

It is easy to overlook the importance of traditional cutting in Sri Lanka, which is often associated with bulky cuts. These traditional cutters use simple hand-powered cutting machines to produce some of the best-oriented stones in the world. Their ability to orient a stone for the best face-up color or placement of a star or cat’s-eye, while retaining maximum weight from the rough, is remarkable.

Equipment
Their equipment appears primitive, but the skill level of Sri Lanka’s traditional cutters is unsurpassed among traditional cutters. They have a wealth of experience in orienting a rough stone to obtain the best face-up color. Photo by Andrew Lucas/GIA.

Expert Cutting in Colombo

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Traditional cutting may in fact be the best technique for some high-end sapphires or stones where the placement of color is critical. There is also a growing demand for Sri Lankan recutting to meet customer specifications. Global clients have different proportion expectations—some allow windows, for instance—and recutting stones that have already been oriented for best color can make them less bulky. The cutters can remove enough windowing to suit a customer’s needs while retaining as much weight as possible. There is also a growing precision-cutting industry in Sri Lanka that meets the strictest tolerances of proportion, symmetry, and calibrated size tolerances. 

Precision Cutting

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Interviewing a Master Cutter

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Trading

Surpassed by Thailand in the 1970s and ’80s, Sri Lanka has modified its business strategy and import/export regulations to restore its position as a major global power in colored gemstone trading. By simplifying the import process and removing prohibitive duties, Sri Lankan dealers are now able to buy rough sapphire from anywhere in the world, including major sources such as Madagascar. They can apply their knowledge and be competitive in obtaining the raw materials to fuel their industry. Abandoning protectionist import regulations on rough from foreign sources has actually saved Sri Lanka's gemstone industry from remaining a smaller player. A smoother export process has also attracted foreign buyers to the country.

Foreign Buyers
Foreign buyers often work with trusted local contacts who bring in a wide variety of inventory from other dealers to their offices. Photo by Andrew Lucas/GIA, courtesy Sapphire Capital Group-Sapphire Cutters.
We visited Sri Lankan dealers in Colombo and Beruwala, as well as mine markets in Ratnapura, Balangoda, and Elahera. The mine markets were bustling with activity among Sri Lankan dealers and foreign buyers. The dealers were often in the outdoor street markets and in offices or cutting facilities. There were also heat treaters, known as burners, at all of the major markets. Many of the foreign buyers sought the guidance of a trusted local dealer who would have other dealers bring in goods for sale. These trusted dealers would also be consulted for quality, price, and the potential for recutting and further heating.

Street Market
Beruwala has a large, bustling street market for gemstones. Photo by Andrew Lucas/GIA.
New consumer markets such as China have revitalized gem trading in Sri Lanka. This has led to increased imports from global sources, while fueling the need for Sri Lankan dealers’ expertise and experience to satisfy the demands of Chinese manufacturing and domestic consumption.

Inside the Sri Lankan Gem Trade

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Coming Next

In Part Two, we will reveal aspects of the Sri Lankan gemstone and jewelry industry that have seldom been covered, especially by outsiders. The country’s jewelry manufacturing and retail industries are very dynamic, blending strong traditions with important innovations. These sectors of the Sri Lankan industry are very different from their counterparts in other parts of the world such as the United States, Europe, Japan, and China. We will show you the sites we visited so you can get a better sense of this famous and exotic trade center.

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