Have checked
No fake, but poor quality pure gold worth $ 277
It has to do with how they spawn in game. They spawn out of Dig Piles and treasure chest, this is by design I would image, More expensive artifacts will likely come from excavation sites. Anyways hope that helps. Anyways just get a artifact covered in clay and place it on a archeology table and take one sim over to that artifact covered in clay and your get a chance at getting a higher quality item., than you can move it later.
Edit: I changed dig pile to artifact covered in clay is the correct one.
Edit: Note There is no guarantee that the debug objects will work as intended.
Maybe this depends on the skill level of the sim. My sim has a level 8. Maybe if he was level 3, this vase would be a fake. We do not know how it was designed
