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Cobalt Educator's Knowledge
Cosmetic set. Dragonflight. You purchase this from in Dornogal; it is contained in the , which you get in exchange for one or 9750 .
The 
Cobalt Educator's Knowledge is obtained by trading either one 
Earth-Encrusted Gem or 
9750 Resonance Crystals to Osidion in Dornogal.
Trade with Osidion
Visit Osidion in Dornogal and trade either one Earth-Encrusted Gem or 9750 Resonance Crystals for the Cobalt Educator's Knowledge.