"Fairest" is the new black :)

A less famous one for today’s first sonnet, but one that I’m finding absolutely amazing this morning  J

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CXXXI

  Thou art as tyrannous, so as thou art,

  As those whose beauties proudly make them cruel;

  For well thou know'st to my dear doting heart

  Thou art the fairest and most precious jewel.

  Yet, in good faith, some say that thee behold,

  Thy face hath not the power to make love groan;

  To say they err I dare not be so bold,

  Although I swear it to myself alone.

  And to be sure that is not false I swear,

  A thousand groans, but thinking on thy face,

  One on another's neck, do witness bear

  Thy black is fairest in my judgment's place.

    In nothing art thou black save in thy deeds,

    And thence this slander, as I think, proceeds.

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The yet at the beginning of the second quatrain is the first (and unusually early) turn, and the although  at the beginning of line 8 is the second.  The riddle is brought to its height in line 12, and the main volta is the save in the penultimate line.  Another one in the afternoon!