I've Lost my Wedding Ring

We were getting ready to leave a friends house tonight and I looked down and my wedding ring was gone. (It had belonged to my great grandmother.) After 25 years of marriage, I looked down and it wasn't there. I'm really depressed. We didn't find it after searching their house, or our house. I was all over the place today. A dress shop in Edmond twice, Barnes & Noble, Sams Club, Walking for 2-3 blocks in downtown Edmond, and I ate a a cafe. It could be anywhere. I'm sick, really sick. Ben said, if we don't find it, he will have another one made, but it won't be the same. How could I lose it and not know it? This is terrible.