This from the Cathedral Basilica in St. Louis, most famous for its mosaics (41 million tesserae is the fugure used, I believe). The Basilica features some interesting decorative stained glass as well -- this is in a chapel on the left as you come in.
full window -
a closer look -
a closer look in reflected light -
there are also these that have lots of interesting old jewels - something I've been looking into recently - I'm looking into making some custom jewels
the full window -
a close up -