Even then, acquiring them is convoluted and expensive – first, Kopylova has to visit the high-security facilities where diamonds are sorted and identify the specimens she'd like to study. Once the acquisition has been approved, then comes the paperwork – all diamonds must travel with a Kimberley Process certificate, which proves its provenance and helps to prevent conflict or "blood" diamonds from entering the market.

 

อ่านต่อได้ที่ โรงเรียนวัดนาขุนแสน
สาระน่ารู้   เครื่องดื่มแอลกอฮอล์

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