A ring with hidden blades! Use cheap glue (obviously only in the middle, NOT over the blades) to cover the blades with a fake gem to disguise it! :D
Silver Leaf Pocket Knife Necklace by contrary on Etsy
Here you go girls! Hidden Knife in Lipstick Case - Self Defense Weapon
Female push dagger on a chain with a crystal.
Concealed Knives Blue CIA Agent Comb with Hidden Knife CKBL Knives For Sale and Swords 2013 - Oh snap!
necklace/self defense weapon I've ever seen. 'Kirpan Necklace' | Eina Ahluwalia #winbottica
Sword Umbrella! trueswords.com/sword-cane-samurai-katana-umbrella-hidden-blade-p-5595.html
Best Pen Knives For Self Defense http://www.absolutesecuritystore.com/personal-defense-protection/pen-knife-gold.html
MecArmy Tactical Ring Self Defense Weapon With Hidden Bottle Opener Function
Deadly DIY Assassin’s Creed Arm Blade Probably Breaks Concealed Weapons Laws | Technabob | Gadgets, Gizmos and Geekery