All are fine now, since they reduced the quality of the jewelry crafting ones, keeping the number of vouchers. The blue ones are quite common and if they're in a common trait they're actually worth doing. The only change I would make would be to increase the trait coefficient a bit, so Swift & Triune give slightly more vouchers, something around 40 instead of 30 for blue, and a similar 10 units increase for purple. The trait stones for those are an order of magnitude more expensive than the rest.
All are fine now, since they reduced the quality of the jewelry crafting ones, keeping the number of vouchers. The blue ones are quite common and if they're in a common trait they're actually worth doing. The only change I would make would be to increase the trait coefficient a bit, so Swift & Triune give slightly more vouchers, something around 40 instead of 30 for blue, and a similar 10 units increase for purple. The trait stones for those are an order of magnitude more expensive than the rest.
Swift has been removed from the loot table. So, if you've gotten them since Scalebreaker, report it as a bug.
I agree on Triune though.
Triune blue are destroyed. Triune for Purple and Gold aren't too bad, since the trait coefficient combined with the expense of the Zircon and Chromium platings means that the trait stone is only a small fraction of the total cost.