A quick summary is that, first, the sonneteer compares the beloved's features (adversely) to elements in nature through a series of similes and metaphors in the first quatrain (lines 1-4). At the line 5 volta (turn in topic), he switches to metaphors comparing what he has noticed in her to what he notices elsewhere through the second quatrain (lines 5-8). At the second volta (line 9), he turns to the topics of her speech and walk by comparing them adversely to music and a goddess. The couplet resolves the paradoxes of the love sonnet, having nothing but unfavorable comparisons, by asserting that in his estimation her unloveliness is as valuable ("rare": valuable, like a ruby or emerald) as any beauty.
Explanation:
im pretty sure its right