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通过从高卢罗马(Gallo-Roman)时代到18世纪这段历史时期的祖母绿制品的氧同位素组成,可以显示历史时期用作加工的祖母绿来源矿床竟被推测为20世纪才发现的矿床。在古代,巴基斯坦和埃及祖母绿通过丝绸支路进行贸易,加上奥地利的祖母绿它们被称为当时唯一的宝石级祖母绿的来源。在西班牙人16世纪发现了哥伦比亚的矿山之后,立刻建立了一条新的贸易路线,首先经西班牙到欧洲至印度,后来直接是经菲律宾到印度。由于这样,哥伦比亚祖母绿占据了贸易的很大份额,而且印度18世纪加工的高质量的祖母绿大多来自哥伦比亚。
Oxygen isotope composition of emerald products from the Gallo-Roman era to the eighteenth century historical period shows the deposits of emerald-derived deposits used for processing during the historical period that were supposed to be discovered only in the 20th century. In ancient times, emeralds of Pakistan and Egypt were traded through the Silk Road, together with Austria’s emeralds, which were described as the only source of gem-quality emerald then. Immediately after Spain discovered the Colombian mines in the 16th century, a new trade route was established, first via Spain to Europe to India and then the Philippines directly to India. Because of this, the Colombian emeralds make up a large share of the trade, and most of the high-quality emerald processed in India in the 18th century came from Colombia.