@Floss_Star It's just like an arrowhead (for segment knotting) but with a bigger middle diamond! If you don't know how to make an arrowhead then you can just search on YouTube, there are plenty of tutorials!
@Floss_Star The thickness (width) of any bracelet will depend on how many strings it has, the thickness of the thread you use, & how firmly (how tight) you tend to tie your knots. Using "standard/typical" embroidery thread (approx 1 mm diameter), a 12-string bracelet is usually about half an inch wide. This bracelet is 10 strings, so it'll be slightly less than a half inch in width when complete. Hope this helps! 😍