All jewelry is made of brass with 18-karat gold or rhodium plating and selectively chosen high-quality crystals. All jewelry complies with EU standards as nickel-safe/nickel-approved, meaning that the nickel content released is below the allowable threshold (0.05%). Nearly all metals contain some trace amounts of nickel, even if in extremely small quantities. The earring posts we use are made of 925 silver. All materials used in manufacturing are consistently tested for the highest quality.