Insider activity I think we can pretty much figure there will be no surprises to the upside with PE buying shares a week before reporting. I don't think he would be buying if there was any surprises to the downside either.
So reporting must be pretty close to the guidance ( if you can call it that) we have received. Of coarse no one knows how the market will react. This equity moves in mysterious ways. Good news would likely result in a wave of selling.
Here is a global diamond mining report for anyone that is interested.
https://www.paulzimnisky.com/2017-global-natural-diamond-production-forecasted-at-142m-carats-worth-15-6b
GK is rated 9th largest mine in the world by carat production in 2017 . We will likely move that rating up in 2018. Behind Davik, ahead of Ekati. This stock looks real cheap to me.