my gym (gracia barra affiliate) uses the white, blue, purple, brown, black system...with the other colors (yellow, green, etc) for junior/child rankings. once a junior green belt turns 16 he's a blue belt. I think this is standard practice for most all bjj gyms.
also we do 'stripes' as mini promotions within a belt which is also a standard practice i think (same as 'dans' in judo).
i've been training for two years, wrestled competitively for 6, and just received my blue belt.
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