Something that's polished has been perfected — either by being rubbed until it's shiny or practiced until it appears skilled and elegant.

A polished diamond is bright, with a smooth, shining surface that reflects light. For an object to be polished, someone has to polish it, rubbing and buffing until it shines. You can also have a figuratively polished version of your essay that's been spruced up through careful editing. If a person is polished, they're graceful or accomplished: "Her polished style of speaking was almost intimidating!"

Definitions of polished
  1. adjective
    perfected or made shiny and smooth
    “his polished prose”
    “in a freshly ironed dress and polished shoes”
    “freshly polished silver”
    emitting or reflecting light readily or in large amounts
    bright, burnished, lustrous, shining, shiny
    made smooth and bright by or as if by rubbing; reflecting a sheen or glow
    (of skills or the products of skills) brought to or having the greatest excellence; perfected
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    not carefully reworked or perfected or made smooth by polishing
    emitting or reflecting very little light
    untempered and unrefined
    not perfected
    of metals e.g.; not made shiny and smooth by friction
    (used of persons and their behavior) not refined; uncouth
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  2. adjective
    (of lumber or stone) to trim and smooth
    synonyms: dressed
    (of materials or goods) brought to the desired final state
  3. adjective
    showing a high degree of refinement and the assurance that comes from wide social experience
    “his polished manner”
    synonyms: refined, svelte, urbane
    having or appealing to those having worldly knowledge and refinement and savoir-faire
  4. adjective
    (of grains especially rice) having the husk or outer layers removed
    polished rice”
    synonyms: milled
    prepared or converted from a natural state by subjecting to a special process
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