Why Certain Brooches Can Stain

If you've ever had a piece of jewelry that makes your skin green you've most likely asked yourself why that happens. Basically ~ your skin is reacting to base metal to people who buys cheap jewelry. It happens to some faster than others; though, because everyone's composition is just a little bit different. Truth be told expensive jewelry can turn you green too~ because even the expensive stuff isnt pure~ no matter how much it costs. Platinum hardly ever reacts with skin so no worries if you own platinum jewelry.
To keep gold jewelry reacting to your skin be sure its not made from cheap metal and then plated – its a cheaper metal with a thin gold layer and that coating wears off very quickly. If you have solid gold jewelry choosing a higher karat only can help reduce the marks that are left on your skin. Copper will react with skin and there isn't a whole lot you can do about that.
Stay away from wearing jewelry when you're sweating a lot it can increase the green skin effect you might also ask your jeweler if they can add a layer of protective coating – in order to try to stop the reaction or minimize it. If you do this you can wear inexpensive jewelry whenever you want.
Just remember- the green effect won't hurt you. It's a chemical skin reaction and not an allergic reaction.
Allergies (such as those to nickel) will make you red plus it could also make your skin feel itchy and inflamed. Which is a far cry from green skin.
If you do show signs of allery stop wearing the jewelry. If it's only turning your skin green you can certainly continue wearing it as long as you like you'll just have to keep the area clean so it doesn't look bad.
All in all coating your jewelry is usually the best option.