'Rubies' in the Bible

She is more precious than rubies: and all the things thou canst desire are not to be compared unto her.

For wisdom is better than rubies; and all the things that may be desired are not to be compared to it.

There is gold, and a multitude of rubies: but the lips of knowledge are a precious jewel.

Who can find a virtuous woman? for her price is far above rubies.