The Spectra - the most loved Jo Bird Necklace of all time. I've worn the silver one every single day for at least 3 years. Hike, swim, run, sauna, shower, the Spectra survives it all. There are women who literally buy these by the half dozen so they will never go without their favorite necklace, ever. Oh, and they make great gifts for groups of girlfriends and daughters. You just can't go wrong.