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! We included opal inlay in many of our Historical Designs inspired jewelry collection. The color of the opal jewelry changes depending on the angle of its light reflection. The Scarab is inspired by the ancient Egyptian times, where the scarab was seen as a symbol of immortality, transformation, resurrection, and funerary art. The life of a beetle was seen as the circle of life, showcasing the cycle of rebirth by passing on your mortality to the next.