I’ve started a thread over in the DAZ forums where I’ve asked for people’s requests for Jewelry they would like to have made for Poser and DAS Studio.
http://forum.daz3d.com/viewtopic.php?t=126152 (I think you need to be registered to see the forum)

Currently I’ve stared on 2 pieces; a necklace and a pendant.

This necklace is based off a necklace Queen Elizabeth I wore for her coronation.

This pendant is based off a sketch by Malandar