As with other martial arts, a student’s progress is marked with a series of colored belts. In Brazilian Jiu Jitsu, the rank of Black Belt is conferred to individuals who have mastered the art of Brazilian Jiu-Jitsu.
The belts in order are: White, Blue, Purple, Brown and Black. Some schools also award four stripes to mark a student’s progress from White through Brown belts. Black Belts are typically awarded one stripe every three years up to ten stripes. There are special classifications for Black Belts fighter and instructors. Instructors have Black Belts with Red bands and Black Belt fighters have White Bands. Typically, Black Belt instructors are not allowed to promote others up to Black Belt rank until they receive their first stripe.
The ranks for children are different. Blue belt and higher ranks have age requirements so children have the following ranks beginning with Gray, Yellow, Orange and Green. Each belt has 4 stripes. These belts are utilized until age 16.
You can find a chart of the International Brazilian Jiu Jitsu Federation’s belt ranking system at: http://ibjjf.org/wp-content/uploads/2014/02/IBJJF-Graduation-System-Poster.pdf