Its there. Ive collected a few purple rings. Although weapons and body pieces where usually green or blue but they are easily upgraded by yourself. If you craft
Silks of the Sun jewelry drops from the chests you open when closing Dolmens in Stonefalls. The item quality of the drop is random (you'll get either green, blue, or purple) as is the type (random choice of ring or neck). There is also a 1/3 chance that you get the jewlery from the Medium or Heavy item sets that also drop in Stonefalls (Red Mountain, or Shalk in the case of Stonefalls).
Stonefalls. It's rare, but its there. Keep doing those dolmen, sooner or later you'll find the purple jewlery... (the rest, well, that's what tempers and a crafting alt are for!! )