It is a circular double helix. To give it some flare the helix transitions from a nearly circular cross section nearest the center to an oval cross section on the outer edge. The connecting rods between each helix are positioned to be hidden from the straight on view. It is these connecting rods that the pendant is hanging from in the photo.
This design can be printed in a multitude of materials. Although it gives the illusion of free floating helixes, they are firmly connected through the six connecting rods.