Quote - I really hope so.  It so sounded like polonium.

If it was polonium at some time, it probably is only lead by now. Because of the low half time of only a few days polonium decays to lead very soon after creation.

Quote - is palladium expensive or cheap?  What does it look like?  The necklace was quite cheap.

What do you mean by "quite cheap"? Because polonium is very rare (world production only about 100 grams per year), a price of ca. $ 1Mio, would be considered "very cheap" (but normally you do cannot buy it from a jeweler). I would not give such expensive things to little girls as a gift, they cannot value this adequately anyway. Also they are highly toxic (the polonium gifts, not the little girls), so they will certainly die if they swallow parts of it accidently.