How can I tell the difference between a good piece of stained glass art and a shoddy piece?

First check for smoothness in the foil or lead soldering. It should not have sharp or rough places. There should be no spaces between the glass & the solder. Hanger rings should be on seam line joinings, for strength. And there should be no (mushyness) in the piece. If large it should be at least [...]

What hardware and method should I use to suspend an antique stained glass window?

I agree with the previous posters: eyehooks in the frame with a wire/chain will do the job. However, be sure that your antique frame is sturdy — windows are designed to support the glass in a stable, supported wall opening, not hang and support themselves and the glass. So, if your frame is narrow/thin or [...]