The phrase "beautiful rainbow" refers to a natural phenomenon that occurs when sunlight is refracted through water droplets in the air, creating an arc of colors in the sky. Full definition
My favorite fish encounter was the most beautiful rainbow parrot fish that I ran into by chance at the end of our tour on our way back was to the boat. (grandbaymen.com)
Available with beautiful rainbow stitching, or in a colorful collection of blue, purple, green, yellow, and white (2 of each). (imaginebabyproducts.com)