Was the golden ship half pendant more likely in the Heart Room or the Observatory?
Considering Gabby and Joe only entered 4 rooms, you would think this half-pendant was easy to find. To this very day though, I don't think anyone has found it. The only possible locations it seems to be are the Heart Room and Observatory. Gabby and Joe never entered the Observatory, but we get a shot of the room during the temple rundown:

As you can see, there's no evidence of the half-pendant being in the Observatory unless it was hidden on the floor somewhere. I do believe the artifact was in the Heart Room for several reasons:
1.) If the Observatory opened from the Wall Climb, it's possible that it was a route that Gabby and Joe could take directly to the Room of the Golden Idols and avoid triple capture. If the half-pendant was located in that room, that means that the Red Jaguars would have to take a path that avoids a temple guard AND contains the half-pendant.
2.) The second scenario could be that the Observatory opens from the Wall Climb and forces Gabby and Joe down into the Heart Room. If the half-pendant was located in the Observatory, that means that the Red Jaguars would have to take a detour route in order to find a half-pendant, which seems very unfair. I know Season 1 was very inconsistent, but most of the time the half-pendant was located on the direct path and one room away from the last guard.
3.) The Observatory doesn't seem to have any sign of the half-pendant, as indicated with the picture I posted.
I do believe the half-pendant was in the Heart Room, but located somewhere on the floor like in Great Seal's temple run. But I've watched this run countless times, and I have never found it at all. Which is very bizarre considering the team only entered four rooms. I know people hate on this team for being slow, but this was one of the most unfair temple guard layouts on the show. I would give Gabby and Joe a second chance, easily.