My fiance proposed last August and we will be getting married August 28th of this year. I have had the fortune to study diamonds and jewelry, and I can tell you that no matter how good the CZ looks, it will still look fake. I bought a CZ to wear on our honeymoon so I don't damage my brand new wedding band or engagement ring while on the beach. I put them next to each other just to see how it would look and there is a huge difference!
It is definitely a personal choice, and if my fiance had proposed with a CZ because he couldn't afford a diamond, I still would have said yes. It just means more to me because although he couldn't pay cash for all of the ring, he was willing to get what he knew I would love! (BTW, he constantly joked that my ring would come out of a vending machine or cracker jack box so I was prepared for just about anything except for him proposing! That was a total shock!)
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"Aspire to Inspire before you Expire"