How Can I take a glass tabletop and attach it to a wrought iron pedestal and make it look good?

if this is a piece of glass that is 1/4inch then that is light in weight and you should take the wrought iron base [WIB] to a welder and get it made larger to hold the glass in total == if this glass top for the WIB is 3/16ths thick then you could put clear silicone [[ or black silicone ]] on the WIB to keep the glass from sliding off the base ... it is always better to have the WIB containing the glass with a lip to hold the glass == inexpensive ways to retain the glass top are not always the safest thing == please consider using a welder to fix the WIB and make the table safe ... a good welder can go several different ways to stabilize the glass top to the WIB..............AND .. I do have experience with this situation as I have had several glass top tables in wrought iron and also the concrete pedestals that had a very thick 4 foot by 7 foot top... a fair amount of care will prevent scratches on that glass topper.. place mats do let the beauty of your patio show and will help you avoid any scratches on the glass......

I would purchase a piece of heavy wood the same size as the glass to weigh it down since it is outdoors, and lay the glass over it. Otherwise a strong wind is liable to knock it over and break. I would also set a heavy planter in the center of it, to help weigh it down. That might work alone, without the wood, depending upon how much of a wind block you have on the deck.

Wrought Iron Pedestal

Use a good quality double sided foam tape. You don't need to use it continuously along the top, cut tabs and place them a foot or so apart.

Wrought Iron Glass Top Table

Try Rockler.com. They sell hardware for glass, you may find a solution there.

Not chicken wire, dogs can chew that and hurt themselves. There are rolls of very fine mesh nylon wire you can just put on the bottom of the fence, along the part your dog can reach. We have done that for our little miniature dachshunds who also slipped through our new wrought iron fence in front. In spite of that, never, never leave them out there alone if you go away. You know how persistent dogs can be, but the rolled mesh works very well. Now our dachsies sit there and try to figure out why it worked before but now they can't get out. I am, however, absolutely sure they are thinking of some other way to get over that fence, so I would never leave them out there alone and go off.