The mineral name of ruby and sapphire is corundum. Red is called ruby, starlight is called starlight gem (six rays), and other colors belong to sapphire. Ruby and sapphire are world-wide names.
The best ruby is blood red, specifically called "pigeon blood red", which is a rare treasure. Sometimes it is more expensive than diamonds of the same weight, followed by pomegranate seed red.
Among all kinds of precious stones, ruby and sapphire are precious varieties. Because they are second only to diamonds in value and hardness and belong to the same mineral, they are called "sister gems". Abroad, ruby represents noble and fiery love and is considered as the birthstone of July.
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