Forget diamond Super Bowl rings ... Sean McVay's smokin' hot GF is opting for crystals for Sunday's big game -- 'cause she just got a custom jacket made with 4,000 of 'em in it!!!
TMZ Sports has learned Veronika Khomyn hit up Leah Miller at Bella Artistry to have a one-of-a-kind piece made to cheer on her BF during the Rams-Pats game ... and the fit came out GREAT.
We're told, the satin bomber jacket was hand-cut and hand-sewn ... and had 4,000 Swarovski crystals hand-placed into it.