LOL, I can tell you two different illegal 3rd party programs running in that video posted of how they are abused. How funny is that!!!!
A player is on foot, up against multiple other players, poisoned, DISARMED, revealed ~ 15 times and ONLY survives due to Teleport/invis items. I don't care what programs they were running, the only things they were doing in the video to survive that scenario could be accomplished through completely legal means. Run all the programs you want, without those two items no one could survive that scenario.
If anyone would argue that these should not be changed because they have been in the game for so long I will remind them about the recent change to animal form. Going animal form was deemed overpowered because it could be cast without being interrupted, They added the ability to interrupt it AND then further nerfed it by making it so faster casting didn't effect it. Essentially making animal form only as good as an ethereal mount for ~90 skill point investment. KEEP in mind, that was the way animal form was since it's Introduction in 2004. It was changed RECENTLY for the same exact reason that players want these jewels changed, it was an easy get away once you were dismounted that would allow you to survive those sort of odds.
No one is asking they do away with these items, No one is asking that they nerf them as bad as animal form. Only that they do SOMETHING because they are tired of watching players escape impossible situations where they did everything right to kill that player.
My suggestion is to Give Invisibility items a timer, just like Potions. Make teleport jewels just cast the spell like it was under protection, then make them craftable under a new name to keep the old ones as rare as they used to be, but give every player access without having to hunt them down from a collector.
This is a joke that this is even being argued after that video.