1000 wins (plus some extra), play with Riot?

I remember hearing that you're 1000th win can be spent with a Rioter, if they're free. It's not me, but my friend. I told him that, and he seemed keen. I know it's not the 1000th win, but he hit 2000 wins without even knowing it recently, so is that acceptable?

P.S. He asked if he could get 2 gemstones instead. He's at 8, and really wants Soulstealer Vayne.