本指南专为向素未谋面的经销商汇款的买家而写。每份指南都详细说明了文件应包含哪些内容、信息披露应如何呈现，以及风险究竟由谁承担。
A fine loose stone crosses borders in a parcel the size of a paperback, and it does so safely thousands of times a week. The machinery behind that, specialist couriers, cargo insurance and customs brokerage, is mature and deliberately dull.
The loose stone trade still runs on bank wires between people who have often never met.