The colors in Du Yu are very mixed. Sometimes after polishing, the brightness and reflectivity of the surface will make Du Yu's sky blue or day blue lose its green, which means Du Yu is called Nanyang Jade. After polishing, its green, that is, emerald, will be eclipsed a lot. (What I want to mention here is that the sky blue and daytime sapphire of Duyu are particularly valuable, because they are basically rare now, so they can remain green without polishing and maintain high economic value. )
The polished pendant ornaments are bright green or dark green. At this time, the green color is more obvious and conspicuous than other variegated colors such as black, white and brown, which makes people look more comfortable and the color is more beautiful.