Transparent and round darker then halo of moon.

Leaving the restaurant walking up a slight hill to the car looking up to the moon partly cloudy with a large colorful halo a transparent round object crossed the halo darker then the halo slowly crossed over it from right to left. It was very distinctive even though it was see through. I thought my husband was looking up and asked if he just saw that? Unfortunately he was not looking up at the time. There were no other objects in the sky such as aircraft at that moment, no lights on the UAP and no noise but I know what I saw. I didn't consume any alcoholic drinks while eating.