This pendant is a diamond-shaped which is lightly rounded and contains another smaller one. I drew a curve and duplicated it without knowing where i went... It results in a geometric and symmetric shape which can be appear as an esoteric symbol... I recommend you to use a thread to wear it ; i made the first knot on the video (
https://www.youtube.com/watch?v=hvIJXc9SaNM&t=12s).
The black thread is not included but you can purchase it on shapeways.com ("Add a chain" blue link, below the red button).