"Look...at...me..." he whispered. - HP and the Deathly Hallows
As Severus Snape is dying all he wants is for Harry to look him in the eye so that he can see his beloved Lily's eyes one last time.
We could totally see Snape giving this gorgeous emerald and diamond necklace to Lily to represent his house and to bring out the green in her eyes. *sigh* Rest in Peace Snape.