Because of the scarab in it, because it is made of yellow glass, which is formed at a temperature of 10 thousand degrees Celsius, meaning that it only consists in two cases, the first is a nuclear explosion and the second is a cosmic explosion. It is likely that the ancient Egyptians obtained this glass from the Kony explosion, which resulted from the collision of a huge ball of fire with the Earth's atmosphere. When it touches the Earth, silica melts in the sand and turns into a layer of glass
This glass was not used in making jewellery for kings only, so neither nobles nor sons of kings use it.