Wedding band gift for my fiance

I bought my fiance a diamond wedding band as a wedding gift. I would like to give it to her on our wedding day, but don't know when. We are exchanging our plain wedding bands during the ceremony, so I cant do it then.

When's the best time to do so?

Thanks.

Maybe in the limo ride on the way to the reception/take pictures? She can wear it on her other hand for the rest of the day or switch bands to take pictures with the diamond one if she feels like it

I also have 2 wedding bands.. a plain and a diamond one and I wanted to make sure they were both with me that day