In the above publicity picture of Lucy and Ricky in the livingroom set we see an ornate french looking brass and mesh fireplace screen.
I found an identical one that was sold online listed as a Victorian Brass Firescreen at
http://www.sellingantiques.co.uk/131810/victorian-brass-fire-screen/

it is described as an attractive 19th c. cast brass fire guard in the Rococo Style.
Height 32.5″ …82cm
Width 31.5″ …. 80cm
Depth (feet) 9″ … 23cm

In this screen capture we see another ornate rococo style fire screen. I have not yet found an exact match for this one, however the fireplace screen pictured below is a close match – the main difference appears to be the center piece and the border detail at the bottom.
http://www.westlandlondon.com/stock/firegrates/firescreens/item/12146/summary.htm?page=1
It is described on the  website as “A high quality and ornate Baroque/Rococo style Firescreen, the ormolu brass frame spanned with fine gauze spark screening.”  The word ormolu actually means gilded bronze  but the website description uses the words “ormolu brass” –  the close up pictures on the website look like brass to me.

There is a similar looking one in the  Christie’s closed listings HERE part of a lot of two screens that sold for $15,000 in 2011 way beyond their estimated price range

Price Realized
$15,000
Estimate
$2,500 – $3,500
Sale Information
SALE 2504 —
A TRUMBAUER ESTATE ON THE PHILADELPHIA MAIN LINE
15 April 2011
New York, Rockefeller Plaza

I will be looking for a much cheaper one on eBay.com