The jewelry made is highly collectible. According to relevant information, cameo is an art form of carving concave and convex patterns on the surface of gemstones, which is simply embossed jewelry. There are many kinds of relief jewelry, most of which are agate and shellfish. "Relief gem is a kind of relief jewel, designed and carved on multi-color layered materials such as gems and shells. The most common are two colors, the upper layer is carved with the main body and the bottom layer is used as the background.