In the original "Wizard of Oz" book & in the musical "Wicked", the slippers aren't "ruby" but this metallic color
[DOC] [TLE] WIZARD OF OZ DOROTHY RUBY SLIPPER RING HOLDER ... [PAR] Wizard of Oz Dorothy Ruby/Silver Slippers Quote Art Book Print - ...... Westland 
Wizard Of Oz The Wicked Witch Musical Figurine Ding Dong Witch Is Dead.