These question are based on literary Appreciation.I have said too much unto a heart of stone,And laid my honour too unchary on it', There's something in me ...

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The "heart of stone" in the line is an example of a metaphor. A metaphor is a figure of speech in which a word or phrase is applied to an object or action to which it is not literally applicable. In this case, the speaker is saying that the person they are addressing has a heart that is hard and unyielding, like a stone. By comparing the person's heart to a stone, the speaker is emphasizing the lack of emotion or empathy in their behavior.