Measuring 12cm to fit from 3 months to 15cm to fit around age 4 or 5, this hypoallergenic, highly polished, steel bracelet has gold IP.  What is Gold IP?  "To begin with, a layer of titanium nitride is added to the base surface of stainless steel. Additionally a final plating metal (in this case, 14k gold) is added to the surface; the thickness of this layer is no more than 0.3 urn. ... Given its durability and chemical stability, ion plating is rightly called “permanent."  Also available in hypallergenic steel without gold IP.