Pendant Dimensions 30x20 mm ( 1.2 x 0.8 inch ) Material: Gold Filled Silver 925K (20% Gold out of the weight) Each piece of our jewelry is hallmarked GF 18K Gold-filled jewelry is a layer of gold bonded to the surface of silver using heat and pressure, great economical alternative to solid gold. it can last as long as solid gold and won't tarnish or rub off. it should last somewhere between 10 to 30 years. What’s more, it costs a fraction of the price of high carat gold pieces. It’s a win-win!