In addition to being safe to wear for those with metal allergies, niobium findings come in a range of wonderful colors such as blue, purple, yellow, green, and brown. Many jewelry supply companies such as Rio Grande, Rings and Things, and Fire Mountain Gems and Beads sell a range of niobium findings including ear wires and jump rings. In my project called Ohm Raku Earrings, I used blue niobium ear wires, and they look great with the copper wire and turquoise colored ceramic beads.
Because the metal is anodized, the coloring will not chip or peal off. Though this is not considered a precious metal, the reason it is hypoallergenic is because there are no nickel alloys in the metal, and most people with metal allergies have problems with nickle. It is the major reason for metal allergy issues in other metals such as sterling silver.