How about a Bullet Flower Birthstone Bouquet Expanded Bullet Engraved Personalized in a .50 Caliber Vase.
Or perhaps more to your liking His & Hers Engraved Nickel Birthstone Bullets (cartridges) Personalized Pendants.
Then there is the 40mm Grenade 100% Authentic and Genuine Police Law Enforcement Military Keepsake Memento Engraved Personalized Bullet.
NOT a joke, check it out here: https://www.etsy.com/shop/wildwestjewelryshop/items
No, I have no affiliation with this outfit.