Do I need to declare purchased gems at the airport?

You don’t need to declare legally purchased personal amounts of cut gemstones to Sri Lankan customs when you’re leaving the country, but you are required by law to declare them when you arrive in your home country.

Sri Lanka treats your jewellery purchase like a normal retail export. Yet places such as the USA, UK, Australia, and several EU nations use specific cash thresholds for imported luxury goods. If you fail to declare a high-value sapphire when you come back home, that is treated as customs fraud, and it can end with the gemstone being confiscated.