Gems Stats

Note that the only new changes from regular Diablo 2 to the D2x version of gems mostly take place in the shields defense and resistances.  Everything else stayed pretty much the same.

Amethysts:

Quality

Weapon

Helm or Armor

Shield

Clvl Req

Chipped

+40 to Attack Rating +3 to Strength +8 to Defense 1

Flawed

+60 to Attack Rating +4 to Strength +12 to Defense 5
Normal
+80 to Attack Rating +6 to Strength +18 to Defense 12

Flawless

+100 to Attack Rating +8 to Strength +24 to Defense 15
Perfect
+150 to Attack Rating +10 to Strength +30 to Defense 18

Diamonds:

Quality

Weapon

Armor or Helm

Shield

Clvl Req

Chipped

+28% damage vs. the undead +20 to Attack Rating +6% Resistance to All 1
Flawed
+34% damage vs. the undead +40 to Attack Rating +8% Resistance to All 5
Normal
+44% damage vs. the undead +60 to Attack Rating +11% Resistance to All 12

Flawless

+54% damage vs. the undead +80 to Attack Rating +14% Resistance to All 15
Perfect
+68% damage vs. the undead +100 to Attack Rating +19% Resistance to All 18

Emeralds:

Quality

Weapon

Helm or Armor

Shield

Clvl Req

Chipped

Adds 5 (5.9) poison damage in 1 sec +3 to Dexterity +12% Poison Resistance 1
Flawed
Adds 11 (11.7) poison damage in 1 sec +4 to Dexterity +16% Poison Resistance 5
Normal
Adds 17 (17.6) poison damage in 1 sec +6 to Dexterity +22% Poison Resistance 12

Flawless

Adds 23 (23.4) poison damage in 1 sec +8 to Dexterity +28% Poison Resistance 15
Perfect
Adds 29 (29.3) poison damage in 1 sec +10 to Dexterity +40% Poison Resistance 18

Rubies:

Quality

Weapon

Helm or Armor

Shield

Clvl Req

Chipped

+3-4 Fire Damage +10 to Maximum Life +12% fire resistance 1
Flawed
+5-8 to Fire Damage +17 to Maximum Life +16% to Fire Resistance 5
Normal
+8-12 to Fire Damage +24 to Maximum Life +22% fire resistance 12

Flawless

+10-16 to Fire Damage +31 to Maximum Life +28% fire resistance 15
Perfect
+15-20 Fire Damage +38 to Maximum Life +40% fire resistance 18

Sapphires:

Quality

Weapon

Helm or Armor

Shield

Price

Chipped

+1-3 Cold Damage
1 second Cold Time
+10 to Maximum Mana +12% to Cold Resistance 1
Flawed
+3-5 Cold Damage
1.4 second Cold Time
+17 to Maximum Mana +16% to Cold Resistance 5
Normal
+4-7 Cold Damage
2 second Cold Time
+24 to Maximum Mana +22% to Cold Resistance 12

Flawless

+6-10 Cold Damage
2.4 second Cold Time
+31 to Maximum Mana +28% to Cold Resistance 15
Perfect
+10-14 Cold Damage
3 second Cold Time
+38 to Maximum Mana +40% to Cold Resistance 18

Topazes:

Quality

Weapon

Helm or Armor

Shield

Clvl-Req

Chipped

+1-8 Lightning Damage +9% chance to find magical items +12% Lightning Resistance 1
Flawed
+1-14 Lightning Damage +13% chance to find magical items +16% Lightning Resistance 5
Normal
+1-22 Lightning Damage +16% chance to find magical items +22% Lightning Resistance 12

Flawless

+1-30 Lightning Damage +20% chance to find magical items +28% Lightning Resistance 15
Perfect
+1-40 Lightning Damage +24% chance to find magical items +40% Lightning Resistance 18

Skulls:

Quality

Weapon

Helm or Armor

Shield

Clvl-Req

Chipped

Steals 2% life and 1% mana per hit Replenish life +2 and mana regen. 8% Attacker takes damage of 4 1
Flawed
Steals 2% life and 2% mana per hit Replenish life +3 and mana regen. 8% Attacker takes damage of 8 5
Normal
Steals 3% life and 2% mana per hit Replenish life +3 and mana regen. 12% Attacker takes damage of 12 12

Flawless

Steals 3% life and 3% mana per hit Replenish life +4 and mana regen. 12% Attacker takes damage of 16 15
Perfect
Steals 4% life and 3% mana per hit Replenish life +5 and mana regen 19% Attacker takes damage of 20 18