Ratnapura, the City of Gems, is laced with a labyrinth of underground corridors that have been worked continuously for generations. While modern open-pit operations exist elsewhere in the world, the heart of Sri Lankan mining remains deep, timbered shaft mining—a system refined over centuries to preserve the lush agricultural landscape above.
The Timbers of Marambe
Deep underground, the shafts are reinforced with local hardwood timbers and woven fern mats known as *keta kekilla*. These organic walls allow groundwater to seep through without causing collapses, keeping the working face stable. Miners follow the *illam*—the ancient gravel-bearing layer usually situated beneath layers of clay, sand, and organic silt.
Sifting the Illam
Once the gravel is hauled to the surface in woven bamboo baskets, it is taken to nearby flowing water channels or pits. With rhythmic circular motions, skilled miners wash away the mud until only heavy minerals remain: garnet, zircon, spinel, and if fortune smiles, a lustrous blue sapphire crystal with its natural bipyramidal hexagonal shape intact.
Educational Access
Through Rathnadeepa's guided expeditions, guests can observe these operations safely with registered mine masters and certified safety gear, gaining an authentic understanding of the toil and skill that precedes every faceted gem in high-end jewelry stores.
