Εξισώσεις ισορροπίας / Equations of balance

Stones: an inexhaustible uniqueness

It all started picking a tiny stone after an optical stimulus followed by fantasying. Random or not stones in balance?
Pendants made of stones enclosed in metallic casted shells. The shells metal alloys vary according to the stone colour. In the pictures: bronze, silver 950 and an assorted of cold alloys. The sizes go from 10 to 40mm.