The girl that already has everything can now add diamond necklace to her list of enviable possessions, according to an online report. A special-edition Barbie with a pink and colorless diamond necklace will be offered at Christie’s in New York City on October 20 for an estimated $300,000–$500,000. Jeweler Stefano Canturi designed the 3 cts. t.w. piece. Sale proceeds will benefit breast cancer research.