Blue Warrior. Blue is a primary color, and this shade, recognized as cobalt blue by artists and designers, is unsoftened by any compromising tints. This pure blue, presenting in a formidable size and round cut, is formidable. This shade of blue conjures the pennants of Crusaders and the heraldry of medieval Europe. This is a blue that takes no prisoners, negotiates with no one. It will make a heart-stopping addition to any collection, worthy of any sceptre, crown or massive ring of the ancient world. Gemstone Details