大理岩型红宝石矿床是红蓝宝石矿床的重要类型。

Ruby deposits in marbles are the most important source of ruby.

youdao

他们还以为这是红宝石宝石红壮观。

They also thought that this magnificent red gem was ruby.

youdao

他们还以为这是红宝石宝石红壮观。

They also thought that this magnificent red gem was ruby.

youdao