What about using second ring to create the engagement ring, and then use the stones from the first one to create a beautiful wedding band? If you find the right jeweler, he/she could do something amazing.
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“All his life he tried to be a good person. Many times, however, he failed.
For after all, he was only human. He wasn't a dog.”
― Charles M. Schultz
Warning: The above post may be dripping in sarcasm and full of smartassedness.