1985-S DCAM Dime - Worth Grading And Value?

*** Edited by Staff to Add Year and/or Mintmark and/or Denomination to Title. It's essential to have it in the title. ***

Attached are a couple photos of my 1985-S proof dime. I find it particularly stunning visually due to the gun-metal blue toning of the mirror background, which contrasts the beige toning of the frosted Roosevelt surface. As you can see in the photo, this gives a flesh-tone appearance to the face and presents the image like a three dimensional photograph rather than a metal coin! The photos were taken while the coin was in it's holder, so the white specks over the mirror surface area I believe are dust particles on the plastic film.
I am wanting to sell the coin, so worth grading, what's the best avenue to sell such a coin, and value to expect?
Thanks in advance.