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Open the section "Definition and Classification of Gems" under the section "Overview of Gem Processing and Materials", Only in the video, associate professor Liao wangchun of the jewelry department of Jinling institute of science and technology explained: there are 45 varieties of natural gemstones, 32 varieties of natural jade, 9 kinds of available and national standard named organic gemstones, and the most important types of artificial gemstones are synthetic gemstones, artificial gemstones, pieced gemstones and recycled gemstones...一代武术名家的传奇，全新上演……An anti-smuggling ship posing as a criminal该剧讲述的是只当了7天王妃就被废黜的端敬王后（朴敏英 饰），与朝鲜中宗李怿（延宇振 饰）的生死恋情，从废妃的视角讲述被燕山君（李东健 饰）臭名昭著的历史所掩盖的爱情故事。FOX正式宣布续订 #紧急呼救# #9-1-1# 第二季！《紧急呼救》讲述警察﹑医护人员及消防员所面对的高压﹑可怕﹑震惊情景。这些应对紧急情况的人得平衡好自己，在帮助别人的同时，也得解决自己生活中的问题。杨菲雪换上郝英俊的心脏开着他的酒吧，周远光还是医生，李泽照顾着郝英俊的母亲，一切貌似都还是原来的模样。