Rick's Astronomy Jewelry sells pretty sterling silver and gemstone earrings representing major constellations. The gems aren't selected just for beauty - they actually match the color of the stars in the constellations.
And if you buy now you can take advantage of the 18% off end-of-the-year sale (through December 31). Earrings are sale-priced at $45.
Shown: Pleiades (The Seven Sisters) Earrings
(via Fashionably Geek)