After enlarging the hole in these smoky quarts crystals I make a little ball at the end of a copper wire, put it through the stone and wrap a little hoop. I hang the stone on 20mm sterling silver hoops.
If you'd like another size hoop it's of course possible, just contact me before purchase.
I give both the wire around the stone and the hoop a rustic antiqued finish by oxidizing and brushing it.
Since the stones are natural they are a bit irregular in shape but they measure approx 15-20mm. If you order a pair I will of course do my best to choose a pair of stones that are matching.