Perfect Emerald can be inserted in any socketed equipment.
The base weapon type of a regular weapon can be upgraded to its exceptional variant by transmuting a regular Set Weapon, a Ral rune, a Sol rune, and a Perfect Emerald.
To upgrade an exceptional set weapon from its base Weapon type to its elite variant, transmute it together with a Perfect Emerald, a Lum rune, a Pul rune, and an exceptional set weapon.
+100 Poison Damage over 7 Seconds
40% Resist Poison
Helms & Armor
+10 to Dexterity
How to upgrade
You can upgrade Perfect Emerald by using a Gem Shrine or by using the Horadric Cube. Gems can be upgraded to higher quality gems by using the Horadric Cube. After inserting three Gems of the same kind into the Horadric Cube, press the Transmute button.
In Diablo 2, gems are valuable objects that possess inherent magical powers. These Gems have the ability to add potent magical powers when fitted into a socketed item. Stronger impacts are seen with gems of higher grades. Gems are categorized into five grades: chipped, flawed, standard, flawless, and perfect.