The necklace and earrings were only available at the Jewelry Expo, but you can now find them in my store - Caroline's Jewelry on the sim Lo Lo.
Comet Earrings, Star Navel Ring (with twinkle on/off), and Moon & Stars Necklace.
They are not in the new release area, since they aren't new. But are with the other Star jewelry (to the left as you enter)