The summoner's "Emerald Carbuncle" should be the color green, not blue like the regular "Carbuncle" seeing how actual emeralds are green in color. The "Carbuncle" and "Emerald Carbuncle" even use different names for both the level 2 and 22 spells, pet glamour setting and name shown above the carbuncle when using the pet glamour. Both the ruby and topaz carbuncle follow the correct gem color so why couldn't emerald also be correct?