'Now anyone with a nickel allergy, eczema or sensitive skin concerns can wear fashionable nickel-free earrings when wearing Blomdahl caring earrings. All metals contain some amount of nickel. Titanium binds what tiny amounts of trace nickel are present and is the safest of all metals to contact if nickel allergic. Gold titanium looks like brushed 18K gold. For those exquisitely sensitive to nickel, Blomdahl also offers medical plastic earrings with 0% nickel. Emerald is the birthstone for MAY.