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Material

In my shop all stainless steel interchangeable jewelry parts are made of stainless steel AISI 304 or AISI 316.

All stainless steel has a nickel, but it is important how many of nickel will be released in the derma-contact. A study of nickel release and allergic contact dermatitis from nickel-plated metals and stainless steels was published in more journals. It was shown that low-sulfur stainless steel grades like 304, 316  release less than 0.03 microgram/cm2/week of nickel in acid artificial sweat and elicit no reactions in patients already sensitized to nickel.

steel typeNi-release in pH 4.5, μg/cm2/weekAllergy reaction of test persons, %
304<0.030
316<0.030

alloying elements stainless steel 304 stainless steel 316
Ni8.65%11.29%
Cr18.18%17.87%
Mo0.26%2.15%
C0.036%0.021%
S0.0069%0.018%
Mn0.81%1.67%
Si0.49%0.61%

Source: www.edelstahl-rostfrei.de