白宝石即氧化铝单晶（Al2O3），是迄今为止，世上最硬的氧化物晶体，具有优良的导热、绝缘、抗化学腐蚀、耐磨损以及光学性能等。
此星座看起来像一个半圆，在它中间是一颗如同白宝石般被称作“杰玛”的星星。
This constellation looks like a half-circle, in middle of which is a white jewel of a star called Gemma.
在此基础上实验观察了白宝石单晶中的位错、亚晶界和小品面等缺陷的形态、数量及分布，讨论了生长条件对它们的影响。
The void formation and its micrograph of distribution, density as well as void size in sapphire single crystal grown by EFG were investigated.
矿工在南部非洲莱索托王国已经找到一个世界上最大的钻石，接近完美的白宝石重量将近500克拉，矿业集团钻石上周日说。
MINERS in the southern African kingdom of Lesotho have found one of the world's largest diamonds, a near-flawless white gem weighing nearly 500 carats, mining group gem diamonds said last Sunday.
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