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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...Peter Boyd探长指挥着一支经过多种训练的警探和科学家的警察队伍-悬案小组，使用现代的方法和原来调查时还没有的新科技来专门调查的未破获的老谋杀案。在他看来。6月，北方大学，2002届毕业生毕业答辩典礼，安晴晴在急切的期盼和等待着哥哥安然，等来的却是安然车祸生亡的消息。该剧每集都是一个独立的刑事案件，其创作手法大胆新颖，更强调案件的故事性、可看性；有貌美如花的女明星在家中被谋杀之谜；有三个痴情而愚昧的女人为了同一个欺骗他们的男人而相继奔赴黄泉；有忠厚的老实人摇身变成变态杀手；有青春少女被骗失身，却靠修复处女膜而再嫁九次，还有因“借种”惹来的命案和种种奇案……玉米闷声道：我在园子里面逛了一圈。杨长帆左右为难。