keycheng
参加中国大陆和台湾的GIA 课程
以汉语普通话在台湾提供的课程与实习班包括：研究宝石学家文凭课程、钻石文凭 ... 上海交通大学上课地点：上海市淮海西路55号（上海交大申通信息广场9楼A座）
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keycheng's website is keycheng.com
