RG0131CU - JADE BlackDESCRIPTION RIGARDS 20 Spring Summer Collection. This is a new item made of rust treated copper that has been newly added this season. There are two colours, red rust and blue rust. Each item is dipped in a special chemical to adjust the colour and the immersion time is adjusted in accordance with the sense of the designer so each item has a different look. You can see the difference by looking at the blue rust that has more of a rough surface. As it