红宝石是对红色矿物刚玉的俗称，它是一种珍贵的宝石。
Ruby, the common name for the mineral corundum in its red form, is a precious gemstone.
作为一种珍贵的宝石，红宝石是一种红色的矿物刚玉。
Rubies, valued as precious gems, are the mineral corundum in its red form.
只有红色的刚玉可称为红宝石，其他任何颜色是命名为蓝宝石。
Only red corundum is entitled to be called ruby, all other colours being classified as sapphires.
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