please help me identify these marble pedestals

Does anyone know how I would find out what these are or even what they are worth? Columns are solid marble and the piece in the middle has a solid marble slab on the top.

Thank you so much for any help!!!

 

Would say these are in the French Empire style but not of the period. As such they will not have the kind of value that an antique would. I am sure they were probably pretty expensive when new. On the secondary market, they are worth what the market would bear and value really depends on location, selling venue, and clientele. Here in my semi-rural Midwest location, I would have a hard time finding a buyer at any price. In a large city in a nice shop, I could see these priced approaching 2K. Your selling value is probably somewhere between the two. Keep in mind that in general, you might expect 1/3 - 1/2 the selling price that a dealer(shop owner) might sell these for. If selling to an end-user, you might get closer to full retail if you can find the right buyer.