Are those bullet casings? Either way, this is gorgeous.
Bullet Casing Necklace 7.62x51 Brass Casing. Edgy grungy apocalyptic jewelry for men or women. Stand out from the crowd and look like a bad MF'er (BAMF!) with this empty bullet shell necklace. - by DigitalCake.etsy.com
Bullet Jewelry Necklace Bullet Casing Necklace by ScarlettSage, $38.50