Can I buy my own engagement ring?

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I'm engaged but I'm not wearing a ring. My boyfriend proposed to me during the Christmas holidays but didn't give me a ring because he couldn't afford to buy me one he knows I will appreciate. He told me he will get me the ring before our wedding in August but it's becoming embarrassing because whenever I tell people I'm engaged they look at my fingers to see the ring and there's nothing there. Ever since I saw Tiwa's engagement ring I've been feeling really sad. I make far more money than my fiance and can afford to buy the ring of my dreams. Should I go ahead and buy my own engagement ring? My man will be mad and disappointed but I'd rather that than the way I feel at the moment.

What do you guys think?