Since I still have them I looked up the Selling Price for you:
Golden Obelisk - 100,000 *wow!*
Magic Mirror - 16,000
Pillory Platform - 1,200
don't know which is the Friendly Gallows.. have to go through the deco inventory again.
The Carriage is the simple one that drops from one of the Castle Adventures.. it's on Sale too in the market for 200 gems. I'll attach picture.
Attachment 45060
Edited to add: Friendly Gallows - 1,500