After learning<\/a> all about cadmium jewellery, I started thinking about why some jewellery makes your skin turn green. After a little digging I learned that the green reaction on your skin from a piece of jewellery is caused by a chemical reaction due to the combination of the metal in the jewellery and the acids in your skin. The most common culprit is copper.<\/p>\n To avoid discolouring of skin, experts say to stick to stainless steel, platinum and rhodium-plated jewellery.<\/p>\n What about allergic reactions? Some people break out into a rash from certain jewellery, this is due to an allergy to nickel. Nickel is often the base metal for a number of jewellery, whether it\u2019s fashion or fine. The only metals that are known not to contain nickel are stainless steel, 18- or 24- carat gold, sterling silver, and pure platinum.<\/p>\n