ComputerGear Math Jewelry Necklace Golden Mean Ratio Equation Geek Nerd STEM You'll look smart wearing Golden Mean math necklace Math formula necklace exemplifies the beauty and symmetry of the golden mean -- a concept introduced by Pythagoras' wife Theano that's influenced mathematics, science and the arts since ancient Greece Electrostatically Gold-plated 1" charm on 18" necklace Fun math geek jewelry makes a great STEM gift Smart necklace is a ComputerGear exclusive You can return this item for any reason and get a full refund: no shipping charges. The item must be returned in new and unused condition. Go to Your Orders to start the return Print the return shipping label Ship it!