We have covered plenty of unique rings, pendants, and earrings here in the past. The Molecules by Aaron Barnet are quite special. These are perfect for folks who simply love chemistry or want to get their hands on geeky jewelry. You can choose your Molecule design, such as Caffeine, Vitamin C, Testosterone, …, and type. You get to choose the size for your pendant or earrings. Custom Molecules are supported. You can get one of these for as low as $12. These make a great gift for geeks.