What should I give her? Is this okay?

My acquaintance *Ellie* has invited me to her fortieth birthday party next year. It’ll be held in summer and she’s planning it a year in advance. She’s rich and likes pretty rings. I’m poorer, but I found a ring I could afford, secondhand, in an op shop. I noticed she wears lots of soft colours. I wondered if an aquamarine ring on a silver band is appropriate? I was considering a pink sapphire which costs $50 more, but she doesn’t seem to wear a lot of pink clothes or jewellery.

What should I give her? Is this okay?
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