I'm running a supreme master jeweller.
For critical dawn rose jewellery you need these journals made by scholars, wich needed mithril flakes as well last time i checked,
just to get a decent crit chance.
The critted jewellery is also the guild jewellery, so i have one 100% crit per week (not that great).
At the moment i got 3 or 4 large supreme tokens, but obviously can only make one bracer/ring/etc. since the recipe is one week
cooldown as well.
On bracer i have a 1 day cd still after i made one for Paul, not sure if he wants a 2nd bracer also.
The crafted jewellery is definatly on top of what you can have, there are some good but no better quest rewards.
A couple drops/barter jewellery in the game are better than the crafted for some classes, i think not by much though.