Topkapı Dagger, which is considered the most valuable dagger in the world, was started to be made in 1741 CE, by order of Mahmud I, to be given as a gift to the Iranian Shah Nadir Shah, who was a Turk of Afshar. When dagger was ready, embassy delegation, which set out to take gift to Baghdad, returned to İstanbul due to death of Nadir Shah in uprising that started in Baghdad and delivered the dagger to the palace treasury.
Topkapı Palace Museum, İstanbul