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I really love the space-related stuff from ThinkGeek. This Solar Orbit necklace has the sun, the moon, all of the planets (yes, ALL, the nine that I learned in school!), plus an asteroid belt! It’s 18-inches long with a 3-inch extender, and has a lobster clasp.
This necklace is perfect for someone who loves funky jewelry and our solar system! I just bought the sterling silver version, and it’s also available in a brass-plated version. Both are $20 off of their original prices right now, which brings the brass one to half off!