the sultan 's throne , wide and gold and blazing all over with polished green gemstones , stood upon a gorgeous rug woven of many-colored wool and elaborately patterned with flowers and ornaments ; his dress still more magnificent , a robe of marmalade-orange and yellow satin bordered in black over a tunic of blue and yellow silk , with the diamond-encrusted hilt of his dagger showing above his sash ; and an aigrette of diamonds around a great square emerald held a tall spray of stiff feathers affixed to the head of his high white turban .