Absent from Forever: this item ID cannot be found in the Forever client. Its Classic version is shown below.
Data source: game client item records. Forever build 1.60.1.70888 ; Classic Era build 1.15.9.70576 . View the compiled item record . A beta record does not confirm in-game availability. Verify acquisition in the game and official announcements.
Source: Anub'Rekhan, Naxxramas
Classic 1.15.9.70576
Gem of Nerubis
Binds when picked up
Held In Off-hand
+14 Stamina
+10 Intellect
Requires Level 60
Equip: Reduces the magic resistance of your spell target by 10.
Equip: Increases the damage and healing of all spells and magic effects by up to 25.
Sell Price: 7g 26s 51c
Forever Beta 1.60.1.70888
This item does not exist in the Forever client.