I am going to presume that you are speaking of the moment that Romeo sees Juliet and launches into how she looks. If not, you might need to repost the question. I could only find this as the closest thing to a sonnet in this scene.
The basic idea behind his speech/ sonnet to Juliet's beauty is that Romeo's self- torturing and pining for Rosaline is now a thing of the past. The sight of Juliet now has become his focus. He is naturally taken back by his beauty and the opening lines of the sonnet reflect how he sees her from a physical point of view. The comparisons of a "jewel in an Ethiop's ear" and "Beauty too rich for use" should give some indication that he finds her physically beautiful. It should also help to reveal something about his character as being impulsive, as the previous four scenes have revealed him to be miserable about Rosaline and then once he sees the attractive Juliet, all pain disappears. The ending of the sonnet speaks of how he has become a pawn for this sense of "true beauty." The speech/ sonnet ends with the idea that Juliet is beautiful and Romeo has fallen in love with her.
If the reader is to take anything away from this, it would be that Juliet is naturally beautiful. The speech also reflects that Romeo sees "love" and "infatuation" as one in the same. The fact that he is able to immediately fall in love with Juliet is a reflection of how he sees her as beautiful and then is attracted to this. This naturally begs the question of what would have happened had Juliet not been attractive? Would Romeo have fallen in love for her and been able to see this "torch that teaches other torches to burn bright" in the same light? One other implication that comes out of this scene. There is a heck of a lot of objectification that goes on in this speech. True love, it seems involves seeing someone and immediately relegating them into the category of things. The speech expresses this with moving Juliet into the realm of torches, jewels, snowy doves, and the like. There is little discussion of Juliet's emotional sense of being as well as whether or not he will be found in the same light by her as he finds her. I think that this brings out a great deal about Romeo's character and what passed for love in the context of the play. This is not to say that he did not love her. He does die for her, or for some semblance of her. Yet, I think that it is important to note in the sonnet how Romeo initially conceives of his affections for Juliet.