I found a great looking outdoor oval coffee table (there are 42" and 54" sizes) at Frontgate where you can choose between and iron or aluminum base, and can choose between 8 different mosaic tops.

This one is not round & is only 34.5" across but it meets the other criteria. It may or may not be the right "style" for you but it is the first thing that came to my mind.

Here is a link that might be useful: mirrored table

I forgot to paste in the page where you can order the table

Here is a link that might be useful: Mosaic coffee table

Don't know what your budget is.

This place also had one for around $200 and change.

Here is a link that might be useful: bernhardt

Pottery Barn has a beautiful painted round on clearance from $599 to $299...if you like green.

I love it!

Here is a link that might be useful: Pottery Barn

We have a wrought iron and soapstone round coffee table in our family room. I like it because it's good looking, sturdy and not one that you see everywhere.
Lynn

we have a round, hand hammered copper coffee table. It's got a dark patina and get lots of compliments/questions about it. We purchased it at Marshall Fields (now Macy's) many years ago - it still looks great.

parma, that PB table is one I've been oogling too! Unfortunately, in this room the coffee table is green, and definitely not the right green to even consider that table.

Thanks for all the other suggestions. Keep them coming! Budget is not high, under $500 if possible. And the style of the room is probably what you'd call "transitional." Other furniture is fairly contemporary in dark cherry, walls are very light. Trying to lighten things up w/ the coffee table because the other furniture is so dark.

I bought an iron base at a local Mexican style store. Had my granite fabricators do a limestone top. The FP (not shown) has a limestone surround. Same limestone is used on all bathroom counters and it echos the travertine in the kitchen (behind sofa, open floor plan).

{{!gwi}}

Just saw your budget - table base was only a couple hundred, but the limestone/fabrication was not. I did rounded edges and corners to protect our dogs and knees.

Obi table from ZGallerie

Here is a link that might be useful: Obi Table

I'm crazy about this one from Gumps - waaay out of my league:

{{!gwi}}

Here is a link that might be useful: Gumps Copper Kettledrum table

The table posted by threedgrad is by KNF designs... I actually just ordered a mosaic dining table from them. They have a lot more than the 5 designs featured on frontgate. They also have 4 metal finishes as well. If you call them, they will tell you where the nearest store that carries it is and if you don't have one nearby, they can ship you one directly. They come in 30, 36, 42 & 48 " round coffee size, 42 and 54 inch oval coffee size and 48" rectangular coffee table sizes. You can download their entire catalog at their website. Just click on the Garden catalog. They look even better IRL. The only drawback is that the lead time on my patio table is 8 weeks...

Here is a link that might be useful: KNF mosaic tables

Look at Room and Board for some metal based coffee tables with some stone top options and various diameters.