Self-defense rings and jewelry, including knife rings, can be discreet and stylish options for self-defense, but it’s important to research local laws and regulations regarding the ownership and use of these types of weapons.
Ultimately, the best weapon for self-defense is one that the individual is comfortable with and has received proper training on how to use effectively and responsibly. It’s also important to consider the laws and regulations regarding the ownership and use of self-defense weapons in the individual’s specific jurisdiction.
source