Yellow Sparx is the fourth stage a member may reach. Until Gold Sparx was introduced, Yellow Sparx was the highest level a member could reach. The next stage is, Gold Sparx.
Members with 1000-1999 gems are Yellow Sparx.
Members who have Yellow Sparx have been active for at least 64-150 weeks. Active users will be a Yellow Sparx for 63-100 weeks.