Diablo 2 Gem Bonuses in Shields
This page has a list of every Gem in Diablo 2 and what bonuses it will have when placed into a Shield. The values on this page are specifically for the Diablo 2: Lord of Destruction version of the game. In the expansion pack Gems and how much of a benefit they give to you got a significant buff.
If you're looking for information about what bonuses a gem has when placed in a different slot, then use the guides below.
High Rune Bonuses in Weapons/Shields/Armor/Helms
Chipped Amethyst: +8 Defense
Flawed Amethyst: +12 Defense
Amethyst: +18 Defense
Flawless Amethyst: +24 Defense
Perfect Amethyst: +30 Defense
Chipped Topaz: +12% Lightning Resist
Flawed Topaz: +16% Lightning Resist
Topaz: +22% Lightning Resist
Flawless Topaz: +28% Lightning Resist
Perfect Topaz: +24% Lightning Resist
Chipped Sapphire: +12% Cold Resist
Flawed Sapphire: +16% Cold Resist
Sapphire: +22% Cold Resist
Flawless Sapphire: +28% Cold Resist
Perfect Sapphire: +40% Cold Resist
Chipped Emerald: 12% Poison Resist
Flawed Emerald: 16% Poison Resist
Emerald: 22% Poison Resist
Flawless Emerald: 28% Poison Resist
Perfect Emerald: 40% Poison Resist
Chipped Ruby: 12% Fire Resist
Flawed Ruby: 16% Fire Resist
Ruby: 22% Fire Resist
Flawless Ruby: 28% Fire Resist
Perfect Ruby: 40% Fire Resist
Chipped Diamond: 6% All Resist
Flawed Diamond: 8% All Resist
Diamond: 11% All Resist
Flawless Diamond: 14% All Resist
Perfect Diamond: 19% All Resist
Chipped Skull: Attacker takes 4 Damage
Flawed Skull: Attacker takes 8 Damage
Skull: Attacker takes 12 Damage
Flawless Skull: Attacker takes 16 Damage
Perfect Skull: Attacker takes 20 Damage