It could be an unusually shaped rock, tree bark or animal tooth.
In Medieval age personal gifts of betrothals were given as dowries which ranged from coins to precious metals and other items.
As tools developed, came the concept of engraved gifts.
Just like an engraved pocket watch and other engraved items we present today, during the ancient period (500,000 years ago) engraved stone gifts were offered to gods and rulers.
We have found some such stone carvings in the Serengeti Plains of Africa.
Why Did People Engrave?
One of the purposes of engraving was to record history.
One of the typical engraved products found in Egypt (approx. 2000 BCE) were scarabs.
A scarab is an oval or beetle shaped carving in that was frequently worn as an amulet like engraved watches we wear now. Such scarabs were usually inscribed with the names of pharaohs and other royal persons.