No, as far as I know it only works on store items...I guess you could try but I really doubt it will work
Your items are gorgeous, BTW. What you COULD do is list at the sale price, then have a sentence at the very top of the description saying something to the effect of 'We have listed this item at our lowest possible sale price for the upcoming Holiday Season..yadda yadda'. Something like that might work and would catch viewers eyes.