The faceted red gem at its end may have been used to concentrate and project the energies to the crystal sphere below it.
在竿末端的多面体红宝石可能用来集中和发射能量到下面的水晶球体上。
Refractive index is important to identify gems, and refractivity model is the basic graph for measuring gem crystal optic parameters.
折射率是鉴定宝石的重要依据，折射率图式是确定宝石晶体光学参数必不可少的基本图件。
SCP-ZrO2 (gem-grade zirconia) has high purity and is mainly used for making cubic zirconia crystal (artificial gems), and as additive for optical glass and fibre with high index of refraction.
具有高纯度，是制造立方氧化锆晶体(人造宝石)的主要原材料，也用作高折射光学玻璃和光学纤维的添加剂。
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