In Gemology上在宝石学
gemology characteristic宝石学特征
gemology specialty宝石专业
Gemology Equipment宝石学设备
characteristics of gemology宝石学特征
characteristic of gemology宝石学特征
Gemology Art Design平面设计
gemology and mineralogy宝石矿物学
Gems & Gemology宝石和宝石学;期刊
N（名词） the branch of mineralogy that is concerned with gems and gemstones 宝石学