Dark Jewelery Star Bracelet
When Sailor Mercury was turned into Dark Sailor Mercury, her bracelet also changed in appearance. It didn't have a regular silver form. It changed back to its normal form when Ami became good again.

{Dark Sword}
Dark Mercury a sword created out of an icicle, and was her primary offensive weapon. She didn't have many special magical attacks associated with it, and used it mainly for physical attacks. However, during her first appearance, Dark Mercury did use an energy attack with the weapon, which happened only once. The sword was also strong enough to shatter Sailor Moon's Moonlight Stick.