14mm x 20mm Hammered Oval links Links are Soldered Made of 14K Gold filled material. “Gold-filled” is a USA industry standard that legally requires 1/20th, or 5% pure gold by weight. It’s a strictly regulated process that involves pressure bonding multiple layers of solid 14k gold with extreme heat over a core of high quality jeweler’s brass resulting in a durable, quality real gold product. 14k GF materials are not supposed to tarnish for a long time. It's possible for gold-fill to tarnish under certain circumstances, but it should not tarnish easily. The best care you can give your pieces is to clean them gently with water, mild soap, and a soft cloth and only polish them when they really need it. It also helps to avoid exposure to lotions or wash them off your jewelry immediately, especially gold-fill chain, which can capture bits of lotion in all the nooks and crannies