What is the meaning of this Shakespeare quote: "O, she doth teach the torches to burn bright. It seems she hangs upon the cheek of night Like a rich jewel in an Ethiop's ear. "?

This is when Romeo first sees Juliet at the Capulet party. He instantly falls in love with her. He says that she is so beautiful and radiant that she could teach the torches (fire) how to be even more radiant and bright. He goes on personify Juliet as a jewel on the night's cheek. He compares this to a Jewl in the ear of an African queen.