The specific gravity (SG) of gemstones is a constant widely used in gemological property charts.
宝石的比重(SG)不断被广泛使用在宝石特性图表。
A new gemological refractometer based on Fresnel formulas and optical fiber technology was introduced.
介绍了一种基于菲涅尔公式和光纤传感技术研制的新型宝石折射仪。
The spectral analysis techniques have been applied to the gemological study and gemstone identification.
波谱分析技术已被成功地应用于宝石学研究和宝石鉴定领域。
According to the Gemological Institute of America, up until 1896, India was the only source of diamonds.
根据美国某某机构，直至1896年，印度是世界钻石的唯一来源。
So, the mineral component of jadeite is the most basic basis in evaluation of jade quality, and is of very important gemological significance.
所以，翡翠的矿物组成是质量分级评价最根本的依据，具有很重要的宝石学意义。
So, the mineral component of jadeite is the most basic basis in evaluation of jade quality, and is of very important gemological significance.
所以，翡翠的矿物组成是质量分级评价最根本的依据，具有很重要的宝石学意义。
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