Not only are noble metals beautiful to look at, they also never rust. However, most jewelry is fashioned from alloys, i.e. admixtures of multiple metals. Therefore, during melting and casting, oxidation can still occur due to contact with oxygen from the ambient air. To prevent this, the air is drawn out of the melt furnace and replaced with the noble gas argon. The resulting jewelry can glimmer and shine with unadulterated splendor.