I have had so many gems stolen by S8 in gem traps that I refuse to buy gems until there is a confirmation button.
I will just consider this to be the next Sister, Sister goal. I waited to finish part 1 until the Monster Hunt to fight wisps, I can wait until trees are needed and use Willows.
It is just sad that S8 has such low drop rates when the material requirement is so large (and the tree footprint so large too).
Heck, I'm still finishing What Storms May Come, 50 more orange shells until I can make the purple necklace.