It is - and AFAIK has always been - the case that jewelry tied to specific armour sets inherits its trait based on the weight of that armour. After 1T this is more obvious given the increase in set jewelry available, but it's:
Light armour -> Arcane Jewelry
Medium armour -> Robust Jewelry
Heavy armour -> Health Jewelry
The exceptions to this seem to be the unique, 'named' drops from completing quests. Looking through the data it seems as though there's only one 'named' jewelry piece for the Thunderbug set:
[5] = "{ 34752 }, -- Thunderbug Carapace Heretic's Necklace (Arcane)"
I'm not sure which quest rewards this (blue) necklace, though it will be part of the central quest in Malabal Tor.
It is - and AFAIK has always been - the case that jewelry tied to specific armour sets inherits its trait based on the weight of that armour. After 1T this is more obvious given the increase in set jewelry available, but it's:
Light armour -> Arcane Jewelry
Medium armour -> Robust Jewelry
Heavy armour -> Health Jewelry
The exceptions to this seem to be the unique, 'named' drops from completing quests. Looking through the data it seems as though there's only one 'named' jewelry piece for the Thunderbug set:
[5] = "{ 34752 }, -- Thunderbug Carapace Heretic's Necklace (Arcane)"
I'm not sure which quest rewards this (blue) necklace, though it will be part of the central quest in Malabal Tor.
Yes I figured as much but I did, as stated, buy the necklace you mentioned (which was in blue for that matter so I wasnt happy with its quality). I would have loved it in purple ^^. Along with 2 rings ofc.
It does not make sense that it should drop/be rewarded in arcane if its not intended for HA sets to have arcane jewelry, based on the Arcane->LA,Robust -> MA etc.
But seeing as it is avalible, maybe we are supposed to be able to get jewelery in different traits to allow for more build diversity.
My build relies on shields, shields rely on magicka hence the Healthy trait does me no good. I've found a "new" play style that is different than what most magsorcs run and ATM I am not allowed to fully utilize the builds potential due to bad traits on jewelry.