To understand the "jewel" hands it is important to keep two concepts in mind. Firstly, the Bams suit is comprised of "green" tiles (2, 3, 4, 6, 8) and "red" tiles (1, 5, 7, and 9) - for the purposes of the Jewel hands, the other suits also are broken into identical groups.
The Green Bams
The Red Bams
Craks
Red Dragon
Bams
Green Dragon
Dots
White Dragon
Jade Hand - Exposed - Limit - Western game
Pongs (or Kongs) and/or Chows of green Bams with a pair of Green Dragons.
Note: Some players require this hand to contain no more than one Chow, but Shanghai: Dynasty allows multiple Chows in the Jade Hand. Keep in mind that when you have multiple Chows concealed in the hand (the same hand as seen above), the sorting does not separate the Chows as seen above.
This is how a pair of 2-3-4 Chows would look when concealed in the hand.
Pongs or Kongs (many include no more than one Chow) of Green Dragons and Green Bams,
with a pair of Green Bams.
Pongs or Kongs or chows of 2, 3, 4, 6, 8 of Dots, with a pair of White Dragons.
Pongs or Kongs (many include no more than one Chow) of White Dragons and 2, 3, 4, 6, 8
Dots with a pair of Dots (those numbers only).
Pongs or Kongs of Red Bams with a pair of Red Dragons.
Pongs or Kongs of Red Dragons and Red Bams, with a pair of Red Bams.
Pongs or Kongs of Red Dragons, Green Dragons, Red Bams and Green Bams, with a pair of any Bams.
Pongs or Kongs (Chows allowed) of 2, 3, 4, 6, 8 Craks and Red Dragons. Pair of any of those particular tiles.