Mens 18k gold buying ring

Product Name: Mens 18k gold buying ring
I am not sure if gold plated or solid gold so you could be getting a major steal. Home test methods do indicate it is at least real gold plated. Also it's stamped 18k. It does not turn darker if flame applied just gets shinier, I also did a very tiny scratch test on inside of ring where it won't show(see last pic) does not show copper or Nicole just more gold color in which scratch has mostly buffed back out. It is approximately a 10.5. If my scale is accurate it weighs 16 grams. This is really all I know as my husband bought it years ago from a random person who really needed money for gas. Comes with buying the box I've used to display it in. This item will be cross listed so snag it before it's gone.