Horadric Cube not rerolling Scepter

A guide told me to use my Horadric Cube to reroll my scepter + 3 chipped gems = +x to skill on weapon, but nothing happens when I try it. What am I doing wrong?

AFAIK, there is no such recipe,

3 Chipped Gems + 1 Magic Weapon → Socketed Magic Weapon (diablowiki)

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Oh wow magic weapon needed, I am lame. Thanks for this dude, I had no clue and was going nuts!