The 'Bleudame' Spike and Chain hand bracelet look pretty intimidating and would definitely provide an advantage in a fight. However, it is unlikely that ladies wearing this piece will be picking fights and punching strangers. That being said, it is still better to be safe than sorry. Best described as a feminized version of an iron fist or brass knuckles, this piece is still extremely unusual.
Jewelry is normally on the fingers or wrist, but the Bleudame spike and chain hand bracelet sits on the wrist and dangles over the wearer's hand. It is essentially a bracelet for a hand. While it may not be the most practical accessory to choose, this silver-studded wonder has more value as a statement piece than as something one can wear every day.