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One of our favorite moments from Sex in the City 2 was when Samantha (Kim Cattrall) ran into Miley Cyrus on the red carpet—and they were wearing the same dress. The main difference between the two women’s outfits? Samantha’s show-stopping  necklace. Noir has decided to auction off the one-of-a-kind piece; bidding will begin tomorrow at 9 a.m. EST (FYI: the link won’t work until then). The piece, which Noir says would ordinarily retail for around $1500, will start at just $250, and 100% of the proceeds from the sale will benefit the Maimonides Infants & Children’s Hospital. Click through our gallery to see the gorgeous necklace up close and personal!