อัปโหลดแล้ว 6 ปี ก่อนหน้านี้
LONDON — For gem specialists, merchants and gatherers alike, the absolute greatest difficulties are the equivalent — and very natural: How would one be able to ensure the moral provenance of a jewel or valuable stone? Guarantee it is genuine and not phony? How might one secure and track the development of a gem inside a divided and murky store network? What's more, how might one validate responsibility for piece if that is raised doubt about?
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