Red quartzite set within grey granite in a silver setting. The beads are rutile quartz and carnelian.
Drilled Beach Stone with Silver Inlay
Thinly sliced sedimentary granite with a fine yellow vein of quartz (silver bezel)
Drilled Beach Stone – Sterling Silver
Red Quartzite with White Spot (Sterling Silver setting)
“Black Hole” Sterling silver and sand stone
Yellow Quarzite Stone in Silver Ring
Maidstonejewelry's Blog 
I would like to know the right bit to drill rock