Centuries later, gemstones remain woven into Sri Lanka’s identity. In Ratnapura, the City of Gems, miners, cutters and dealers continue traditions passed through generations. The island is reported to produce approximately 75 gemstone varieties from around ten principal gemstone groups. Its reputation reflects the expertise of those who recognise, carefully cut and trade them.
Ratnapura, in Sabaragamuwa Province, remains Sri Lanka’s best-known gem centre. Elahera, in Central Province, is another important producing region, while Meetiyagoda is associated with blue moonstone.
Deposits across the island yield corundum, chrysoberyl, spinel, garnet, zircon, tourmaline, beryl, quartz, topaz and feldspar. Rarer collector gems include sinhalite, kornerupine, iolite, scapolite, ekanite and serendibite. This diversity makes Sri Lanka interesting to gemmologists as commercial stones occur alongside minerals rarely encountered by jewellers.
Sapphire remains Sri Lanka’s undisputed star. The name Ceylon sapphire is internationally associated with fine blue stones, particularly those displaying a bright, medium-blue colour. Yet people sometimes confuse the terms Ceylon sapphire and Ceylon-type sapphire.
Ceylon sapphire refers to Sri Lankan geographic origin, whereas Ceylon-type describes a colour appearance traditionally associated with the island’s fine blue sapphires, without establishing provenance.
Sapphires from other parts of the world can show similar colours, while Sri Lankan sapphires display a broad range of blue shades. Although certain colours are traditionally associated with particular regions, colour alone cannot confirm a gemstone’s geographic origin. The island also produces yellow, pink and violet sapphires, alongside padparadscha, a rare pink-orange sapphire named after the Sinhalese word for lotus blossom.
Some sapphires are prized for optical effects. In star sapphire, oriented inclusions produce asterism: a star that moves across the cabochon as the stone turns.
Sri Lanka is a source of these stones. Their appearance depends on the orientation of fine inclusions and how the cabochon is fashioned to display the effect.
Not every sapphire appears remarkable when recovered. Miners have long recognised geuda, a local term associated with corundum that can appear milky or cloudy. Suitable material may respond to heat treatment with improved colour and transparency. Geographic origin and treatment are separate considerations, as calling a sapphire Ceylon does not establish whether it has been heated.
Beyond corundum, Sri Lanka is renowned for chrysoberyl. Cat’s-eye chrysoberyl displays a luminous band of reflected light, while alexandrite changes apparent colour under different lighting. The Smithsonian collection holds an exceptional 65.08-carat Sri Lankan alexandrite, cut as a square cushion.
Spinel occurs in red, pink, purple and blue, including rare cobalt-bearing blue material. Some examples are valued for their vivid colour, while others appeal to collectors for their unusual shades. Garnet, zircon and tourmaline add further variety, alongside aquamarine, quartz, topaz and other feldspars.
Much of Sri Lanka’s production comes from secondary deposits. Weathering releases resistant gem minerals from ancient rocks, eventually concentrating them in alluvial gravels. Traditional miners reach the gem-bearing layer, known as illam, then bring the gravel to the surface and wash it to separate heavier minerals.
These gravel deposits have supported generations of miners, who identify promising layers and recover rough for cutting.
Traditional mining is often a small-scale enterprise involving landowners, mining-rights holders, miners and equipment providers, with proceeds shared among participants. Cutting and trading have also historically been family businesses, with practical knowledge passed between generations. This network of specialised skills remains an important part of the country’s gem heritage.
Sri Lanka’s National Gem and Jewellery Authority regulates gem mining and requires licences; visitors cannot simply fossick independently.
From medieval travellers to today’s miners, cutters, dealers and gemmologists, Sri Lanka continues to connect people with stones formed millions of years ago. Each gem carries not only beauty, but also a place, a community and a continuing story.
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