Margot Robbie – Looks Snatched Up, But Is It Promise Ring or Real Thing?

Margot Robbie is out of the game ... on the bench ... off the market ... NOT ever going to be yours -- 'cause the Aussie hottie and her man are flashing gold bands that reek of marriage ... we think.

Margot was walking around Toronto -- where she's shooting "Suicide Squad" -- with the gold piece. Thing is ... her beau, aspiring director Tom Ackerley, was sporting similar jewelry last week. Both of them have it on THAT finger.

Robbie and Ackerley hit the one year mark this month... so, it could be perfect timing for him to pop the question.

There's still hope fellas -- they could just be promise rings. Plus, what newlywed or newly engaged chick (especially a smoking hot one in Hollywood) doesn't flash her diamond??

Then again, reality is ... you never had a chance.