One theory is that the sculpting of the orbs could have involved the use of high temperatures followed by cooling, to remove outer layers of rock. The work could have been finished by polishing the spheres with sand or leather.
Viena no teorijām ir tāda, ka akmens bumbas varētu būt izgatavotas, izmantojot karsēšanu un atdzesēšanu, lai atdalītu akmens ārējos slāņus, un beigās nopulējot lodes ar smiltīm vai ādu.