To me this looks like a prettier version of that hand weapon the System Lords use in SG:SG1, or akin to the one they use to operate the transporter rings in the movie. - feminine decorative metal gauntlet
An emerald and diamond brooch/pendant Of ribbon bow design, millegrain-set throughout with old brilliant and single-cut diamonds, decorated to the front with cut-cornered step and square-cut emeralds, suspending two articulated diamond swags, diamonds approx. 3.20ct. total, length 7.2cm. Edwardian or Edwardian style at best guess. Might be early, early Art Deco.