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Niobium is used in jewelry both because it is compatible with skin, and because it can be colored by electrolysis (the thickness of the oxide layer determining the color by interference). These are oxide-layer-colored earrings by Holly Yashi, who seems to be a major producer of niobium jewelry.
Source: eBay seller 4theear
Contributor: Theodore Gray
Acquired: 15 August, 2004
Price: $33.50
Size: 0.5"
Purity: 99%