The listing, Stone Set Ring Enlarger W/Dies Band Sizer Expander Stretcher – Free US Drop Shipping has ended.
This is a ring stretcher that is supposed to work better than the Rathburn one for those rings that have stones. The device does not come with instructions but I found some here: http://tinyurl.com/23r8ta7 . Note in the written and pictorial rehash of the instructional video it says to use caution with stone set rings.
By the way also I think it is better to bolt the device down, so think about being able to do that. I'm not sure if you can't can do it or not without bolting. If anybody knows, please comment :-).
So the device is listed here on eBay and I will drop ship it for free to you: http://tinyurl.com/2f3at8j . For bid gauging this goes for $32.98 including shipping. The seller has a very good rating of 99.6% on over 130,000 sales.
Here is the description from eBay:
"NEW RING ENLARGER SET WITH DIES/ROLLERS.
Comes complete with 17 different European style ring stretcher dies.
Quickly and easily enlarge bands with stone sets without loosening prongs or stressing stones.
Can quickly be table mounted.
You will be pleased with this quality tool."