I think blue is my favorite color
That's a pretty calming favorite color to have. Do you like lapis lazuli in jewelry, or sapphires?
I think sapphires are pretty
They are, and they also can be yellow, purple, or orange, and even more than one color! Why do you like blue so much?
I think it is because my eyes are blue
Well that would be because of an optical effect known as Tyndall scattering. Diffusion of color in a colloid, which the iris counts as.
I did not know that very cool!
My favorite color is red, and yours is blue, we both like primary colors!