This is an issue with Heroic gear that dropped in this week’s Time Walking event. I received a level 610 heroic ring, Band of Abyssal Lord. I attempted to add a gem socket to the ring using a Magnificent Jeweler Setting. When I attempt to add the gem setting, I receive an error message stating, “That item cannot be modified.” I am guessing the bug exists because the loot came from a Time Walking raid in the Burning Crusade era, even though loot is now current as of War Within.
I can confirm I am having the same issue of being unable to apply a Magnificent Jeweler Setting to a Black Temple timewalking ring.
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Here is a follow-up post to reference bug forum posts noting that the Magnificent Jeweler Setting is not working on all jewelry (rings and necks) obtained from Timewalking.
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