Kuruvita (also Kuruwita) is a town in the Ratnapura District of the Sabaragamuwa Province of Sri Lanka, lying in the alluvial gem belt that has been the principal source of the country's gemstone production for more than two thousand years. It is one of several gem-mining towns clustered along the Kalu Ganga and its tributaries, alongside Ratnapura itself, Pelmadulla, Eheliyagoda, and Elahera (the last in the adjacent district).

Geology and production

The Kuruvita area lies within the Highland Complex of the Sri Lankan Precambrian basement, a metamorphic terrain that has been the source of the gem placer deposits worked across the Sabaragamuwa lowlands. The gravels are reworked alluvial sediments concentrating gems shed from gneisses, marbles and pegmatites of the surrounding hills. Kuruvita pits produce the standard Sri Lankan gem suite: blue and fancy-coloured sapphires (including padparadscha), spinel, garnet (rhodolite, almandine), zircon, chrysoberyl and cat's-eye chrysoberyl, alexandrite, moonstone, tourmaline, topaz, and a wide range of minor pegmatite minerals.

Mining is overwhelmingly artisanal, conducted in pits typically four to twelve metres deep and worked by small teams using tubs and sieves. The Sri Lankan National Gem and Jewellery Authority licenses operations and regulates the trade.

Trade

Kuruvita material reaches the market through Ratnapura, the regional gem-trading hub, where buyers and dealers congregate at the daily gem market. The town is sometimes named on stone parcels but more often the regional designation Sri Lankan or Ceylon is used; Kuruvita is rarely cited as a discrete origin on laboratory reports, which generally identify Sri Lanka as the country of origin without further sub-locality detail.

Significance

For the working trade, Kuruvita's significance is as one of the named producing pits within the broader Sri Lankan gem belt. It is one of several names that may appear in dealer descriptions of Ceylon sapphires or related stones, alongside Ratnapura, Elahera, Embilipitiya and others. None of these sub-localities differs sufficiently from the others in inclusion suite or chemistry to be reliably separable on laboratory examination, and the trade designation Ceylon remains the relevant origin for valuation purposes.