Grade? To “burnish” something means to make it shiny or lustrous, especially by rubbing.

What is a burnished American Eagle?

Mint's Burnished American Silver Eagle coin program uses specially burnished blanks, known as planchets. Burnished coins appear less shiny with a matte finish, compared to a standard bullion coin finish. This is due to the specially polished coin blanks that are used to earn the “burnished” designation.

Is burnished the same as uncirculated?

Numismatists use the term burnished to describe the coins' unique finish. Burnished coins appear matte and less shiny when compared to a standard bullion coin. This is the result of polishing the blanks before they are struck. ... Mint identifies burnished coins simply as uncirculated coins.