It is not easy to change hands. For aquamarine, which is easy to produce large carats, the stationmaster of Guangdi Jewelry Inspection Station thinks that its collection threshold is as high as 100 carats. There is also appearance, including the other three items in the 4C principle: color, clarity and cut. They basically determine the "face value" of a gem. It also depends on the influence of the old and the new on the discount rate. Small wear, relatively new, low loss rate; Big wear, old, high breakage rate. There are also different mosaics, which will also affect recycling. Because jewelry recycling is mainly to recycle the gems on it, if it is a group of jewelry, small broken diamonds and small particles of gems are used, and recycling agencies generally do not accept them, so they can only choose to change hands privately.