An Inspector Calls

You could link it back to how at the beginning of the play she says "now I feel truly engaged" when Gerald gives her the ring, showing how she's a bit materialistic as she needed a fancy ring to show she was engaged, and now that she's giving it back to him so easily shows how she's matured and doesn't place as much value on objects? You could then possibly link that to how the attitudes of the older and younger generations during the Edwardian times contrast e.g. Sheila maturing and taking responsibility but her parents not doing so?

This is how I would do it. Focus on how she reacts when Gerald hands her the ring. Make a list of quotes from that scene too. Show how she is purely materialistic as well for a higher mark. Good luck. Compare the different mindset and attitudes of the older characters in the play in addition for top marks. Also analyse how Sheila changes over the course of the play on top of that. Describe what impact this has on the reader. Read beyond the lines of the text in question to infer any meaning that may be hidden. Make notes.