Simply add a gem to any socketed item for this achievement. Gems can be gotten as monster drops, and socketed items can be received as drops or purchased from the merchants in each town camp. You should get this very early in your first playthrough.
For this trophy, all you need to do is find a socketed item and put any one of the 7 different gem types into it and the trophy will pop.
A socketed item is represented by a circle appearing on the weapon or having a grey-colored name, although a grey name could mean the item is ethereal as well so keep an eye out.
The gems you can use for socketing and what they do are as follows:
Ruby
When socketed into a weapon – adds fire damage
When socketed into armor – adds to maximum life
When socketed into helms – adds to maximum life
When socketed into shields – adds fire resistance
Sapphire
When socketed into a weapon – adds cold damage
When socketed into armor – adds to maximum mana
When socketed into helms – adds to maximum mana
When socketed into shields – adds cold resistance
Emerald
When socketed into a weapon – adds poison damage
When socketed into armor – adds to maximum dexterity
When socketed into helms – adds to maximum dexterity
When socketed into shields – adds poison resistance
Topaz
When socketed into a weapon – adds lightning damage
When socketed into armor – adds to magic find
When socketed into helms – adds to magic find
When socketed into shields – adds lightning resistance
Diamond
When socketed into a weapon – adds damage to undead %
When socketed into armor – adds to attack rating
When socketed into helms – adds to attack rating
When socketed into shields – adds all resistance
Amethyst
When socketed into a weapon – adds to attack rating
When socketed into armor – adds to maximum strength
When socketed into helms – adds to maximum strength
When socketed into shields – adds defense
Skull
When socketed into a weapon – adds life and mana stolen per hit
When socketed into armor – adds regen mana and replenish life
When socketed into helms – adds regen mana and replenish life
When socketed into shields – adds attacker takes damage
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