Sri Lanka mines Ceylon sapphire; Thailand cuts and heats corundum at global scale; Dubai re-exports with favourable logistics; Hong Kong finances and auctions stones. During 2024 and 2025, when Sri Lankan import taxes choked rough inflows, the other three hubs captured work that historically passed through Colombo.
Bangkok's advantage is decades of cutting infrastructure, treatment expertise, and buyer familiarity. Dealers can land parcels, heat, recut, and reship within tight timelines. Dubai offers re-export convenience and a regional buyer base. Hong Kong remains an auction and banking node even as retail slows.
Sri Lanka's competitive edge is origin: rough and cut stones with documented Ceylon provenance, hand cutting traditions, and direct mine relationships in Ratnapura. That edge does not matter if rough must leave the island to be taxed rationally elsewhere.
Weight-based import tax reform in late 2025 and January 2026 is explicitly designed to reverse the outflow. Recovery is a multi-quarter process. Traders maintain relationships with Bangkok offices; switching back to Colombo requires predictability, not a single press conference.
For a Ceylon-focused shop, hub competition is why origin on the certificate and media on the listing matter. Buyers can source similar colours from other regions; the Sri Lankan story is supply chain transparency from a mining country that still wants to be a processing country too.