Well as one of the biggest exports from the country, Sri Lanka has a customs office at gem cooperation. Unless if not smuggling, All gems are exported through gem corp customs.
Even the million-dollar sapphires travel in a safety tin box which is made from recycled tin cans, Custom sealed and travels in a special safe overseas.
Once custom sealed no one including the import country customs is allowed to open the package until it’s securely delivered to the receiver.
So don’t worry about your package.