the "nature, lighting, chaos, diamond, mana" jewels are things we left in the past since since we have a very low limit on armor, health is not so important anymore compared to other expansions, the damage is not very noticeable when the main jewels are in comparison, the mana is not very useful when you are aware that the auto-pot exists, all these reasons and many more, make the secondary jewels no longer mentioned or tradeable at high level ( I discard low level ones for those who play PvP)
my suggestion is divided into 3 options
1: combination of different jewels, example ( Fury + nature jewel ) only allowed 1 time per team
2: extra space in each team of the game, special to put only secondary jewels.
3: accessories are extra jewel, only secondary jewels (belt ring, amulet, artifact, bracelet)
4: extra option, make a jewel change, for example 1 container that makes us change 1 noble nature for 1 superb Mind/finesse/fury