Task: Question Answering
Input (English): She had tried over facebook , but he hadn't returned her wall postings . I figured I knew why , but she clutched a large blue rock that was hanging at the base of her neck . The necklace went really well with her blue and red sun - dress . She giggled and said that she had finally put that boys rock on a necklace . After she left I tracked her down , alone . 
Question: What is a likely reason for the rock to be on a necklace ?
Output (English): It has sentimental value