When Romeo first sees Juliet he describes her as a bright beautiful shining light. He does this when he says "she doth teaches the torches to burn bright!" He continues this brightness metaphor when he compares her to a jewel in an Ethiope's ear. An Ethiope is a very dark skinned woman from Africa and the jewel is shining bright against her dark skin. This light on dark contrast continues when he describes her as a white dove amongst a flock of dark black crows.
