The Cornerstone of the World unique jewel cannot be duped for balance reasons.Later on, sell rare (yellow) items to get profit. Yes, the fastest way is to socket a rune into throwing weapon and sell it to any vendor. If you mean how to reroll a Sacred Unique - Enchanted Crystal can do it, but, imo, it's not worth at all because of a tedious process to get one and dissapointing result at the end 3.+3-6 to Summon Shadows), then the bonus is an 'oskill', giving this skill to any class for free

Oskills If an item has a skill bonus with no character class requirement (eg. The stats of each unique depend on the tier of the base item: higher tier versions of the same unique are improved in all aspects, but have higher requirements Each regular item has one unique version that can drop anywhere in the game. Home Median xl unsocket unique Tiered Uniques :: Median XL / Game Guid