Instructors generally called this bi-colored macrame bracelet double spiraled.. But to me it is an awesome DNA inspired design! It's a great gift idea for someone scientifically inclined. 

I chose these two tutorials because they both utilize leather and button clasps. The first one by  MacrameSchool, features a leather core with the regular cords spiralling around it. See the video description for information on how much you need.

MacrameSchool also has some beautiful home decor macrame tutorials.