So [NightHawkInLight]’s recipe starts with aluminum oxide grit-blasting powder and ... [NightHawkInLight] was rewarded with a large, deep pink ruby. This looks like a fun, quick little project ...

We assume the ruby — which is just aluminum oxide — is lab-created and not a natural stone. Another common option is to go with hardened steel nozzles, but Olsson claims the brass nozzles ...