The major world source, especially for the finest material, is Burma, but New Zealand, Japan, Mexico, Guatemala and the US (California) all contribute. Jadeite can be semi-transparent to opaque and covers the spectrum from colorless through white, green, yellow, brown, red, orange, violet, to grey and black in color. Some of the colors are given trade names such as Imperial, apple green, moss in snow or chloromelanite. Imperial is the variety with highly saturated green color, apple green has some yellow, moss in snow has patterns in white and green and chloromelanite is such a dark green as to appear black. Various combinations of chromium and iron are responsible for the different colors. Well polished pieces have a "patent leather" shine, but some lapidary expertise is necessary to produce it. Jadeite sometimes frustrates cutters with its tendency to undercut which can create a dimpled or "orange peel" surface.