Some items will only drop from certain activities.

Triune can drop from pvp rewards
Swift can drop from jewel writs rewards
Bloodthirsty from trials iirc

To be honest the best way to research would be to buy some of these from a guild trader. They won’t/shouldnt cost a lot

You can buy all the required motifs and style stones from traders as well, even if you don't have the DLCs

LootAllTheStuff wrote: »

I seem to be stuck missing the final three traits when it comes to researching jewellery. Are these locked behind either jewellery crafting level or access to specific DLCs, or are they just exceedingly rare drops?

Jewelry from loot drops will almost always be Arcane, Healthy, or Robust. I've picked up several "Exemplary Infused," "Exemplary Swift," and maybe an "Exemplary Protective" from daily crafting writs, but occasionally from Psijic Portals, I think. Exemplary pieces can only be sold to NPCs (500g, I think), used for trait research, or sold through guild traders for whatever someone is willing to pay; they can't be deconned.

I had to get Triune stuff from another player, but it should also drop from board missions in Cyrodiil. I don't mess around with PvP very much, so I'm pretty sure I bought a ring and a necklace through a guild trader for my first character and then used that character made them for others to research. If I'm thinking about it, I'll buy Dawn-Prism from the War Researchers in Cryodiil (got little other use for AP) but usually just buy it from guild traders.

Jewelry in Harmony (and Dibellium, I think) can be included in loot from Undaunted Pledges or from daily random dungeon rewards, but otherwise will probably need to come from another player. Jewelry in Bloodthirsty (and Slaughterstone) can be picked up as loot from Trials.

For Swift, you buy Gilding Wax from Rolis Hlaalu for writ vouchers; for Protective, you get Titanium as a secondary material when mining Jewelry nodes; for Infused, you'll get Aurbic Amber (usually grains, but sometimes whole mats) from Psijic Portals.