These chunky Mother of pearl signet rings are made of titanium steel and 18K Gold & White Gold filled. Titanium steel can hold up well to regular wear without deteriorating. 18k gold-filled finish means a much thicker coating than normal jewelry. Please note these rings are water-resistant. It won't turn your skin green, but to keep the color lasting longer, I would avoid wearing it to shower or swimming. -Material: 18k gold-filled/White gold filled; titanium steel -Water-resistant -Hypoallergenic ❤Hypoallergenic Metals for Sensitive Skin❤ If you have sensitive skin, you should look for materials that are copper-free and nickel-free. The general order of preference for sensitive skin is Pure Gold/Silver/Titanium >> 18K/14K Gold filled/925 Sterling Silver/Titanium Steel >> Stainless Steel >> Steel >> Alloy.