Metal that's been polished until it shines is burnished. If you're a fan of knights, you might enjoy checking out the burnished suits of armor in a museum.

Burnished metal is so smooth that it's almost glossy — light reflects off its surface. A brand new car and a gleaming piece of jewelry both have a burnished look. To achieve this effect, a metalsmith has to burnish, or polish, the metal. You can use this adjective figuratively too: "He revised that book report until it was burnished."

Definitions of burnished
  1. adjective
    made smooth and bright by or as if by rubbing; reflecting a sheen or glow
    “a burnished brass knocker”
    synonyms: bright, lustrous, shining, shiny
    perfected or made shiny and smooth
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