This is a lovely pattern that can so easily be adaptable in any color combination you want. The crochet pattern is called Reversible Diamond Cowl Scarflette
The instructions come with 3+ sizes, neck warmer . cowl / infinity scarf, plus how to make it easily into a much longer infinity scarf
It appears as if it is two layers of pattern, one being diamond and the other small polka dots, however it is the way you work in the diamond pattern that the polka dots appear naturally, genius!
You can use any yarn, however sample image was worked with Soft Bamboo DK yarn & Crochet Hook Size: 3mm & 3.5mm (UK 11 & 9 / US D3 & E4)
Skills needed – Intermediate
American terminology is used with metric sizes
Color change within a row are shown as part of the written instructions, and many supporting images to the written instructions for extra reference (if you need it)