Lost engagement ring with intricate twist design and small center diamond near a park in Yuba-Sutter.

I realized my engagement ring was missing after I returned home from a picnic in Yuba-Sutter last Saturday. It has a beautiful intricate twist design and is set with a small diamond in the center. I believe I may have accidentally taken it off to apply sunscreen, so it might be somewhere near the park. I'm heartbroken and really hope someone finds it.