Kataragama is a town in the Monaragala District of Uva Province, in the south-east of Sri Lanka, best known internationally as one of the island's most important multi-faith pilgrimage centres. For the gem trade its significance is more modest but real: the alluvial gravels of the Manik Ganga (literally 'gem river') that flows through the town have produced corundum, chrysoberyl, garnet and zircon for centuries, and the locality occasionally appears in trade and laboratory reports as a stated origin for blue sapphires of unusual character.

Geological setting

The Sri Lankan gem fields are hosted by the Highland Complex, a granulite-facies metamorphic terrain of Proterozoic age that runs roughly through the centre of the island. Kataragama lies near the south-eastern edge of this complex, where weathered gem-bearing pegmatites, marbles and skarns have shed their resistant minerals into the river and floodplain gravels. The Manik Ganga and its tributaries have been worked for gems since at least the medieval period, and the sediments yield the same suite of species that has made Ratnapura famous, though in smaller quantities and with more local variation.

Production

Mining at Kataragama is overwhelmingly artisanal. Pits sunk through the overburden into the productive illam gravel, sluiced and hand-jigged in cone baskets, are the dominant method. Output is irregular and never approached the volumes of the western gem fields around Ratnapura, Elahera or Pelmadulla. The corundum recovered tends to be in smaller crystals than those of Elahera but includes blue sapphire, yellow sapphire, padparadscha-coloured material, star corundum and pink sapphire. Chrysoberyl, including some cat's-eye, and a range of garnets and zircons round out the production.

The 'Kataragama' designation

The term 'Kataragama sapphire' is sometimes used in the trade as a regional sub-designation within Sri Lankan origin, generally for blues that show a slightly more saturated body colour than the classic pale 'Ceylon blue'. The designation is not a recognised laboratory origin in the strict sense; the GIA, SSEF and Gubelin issue origin reports as 'Sri Lanka' (or, historically, 'Ceylon') based on the inclusion suite, trace-element chemistry and spectral signature, and do not subdivide to the locality level. Trade use of 'Kataragama' is therefore best understood as descriptive shorthand among Sri Lankan dealers rather than an independent gemmological category.

Cultural context

The town is the seat of the Kataragama devale, a shrine sacred simultaneously to Hindus (who associate it with Skanda-Murugan), Buddhists, Muslims (who venerate the adjoining Khizr shrine) and the indigenous Vedda community. The annual Esala festival in July and August draws hundreds of thousands of pilgrims, and gem and jewellery vendors form a familiar part of the bazaar that surrounds the temple precinct. For visitors and traders, this religious significance has long been intertwined with the gem trade: pilgrims have historically purchased small set sapphires and chrysoberyls as votive offerings, and the bazaar remains a working secondary market for Sri Lankan gem material.

Position in the Sri Lankan picture

Kataragama is best understood as a secondary contributor to the Sri Lankan gem economy, not a major source on the scale of the Ratnapura district. Its production is interesting to specialist collectors and to those who prize the cultural narrative of a stone mined within sight of one of South Asia's great pilgrimage shrines, but in volume and laboratory-recognised distinctiveness it sits well behind the central and western gem fields.