What happened to topaz?

The reasons why jadeite turns yellow are natural oxidation and long-term exposure to pollutants.

1. Natural oxidation: minerals such as magnesium, iron and aluminum in jade are the key elements that cause jade to turn yellow. Exposed to the air for a long time, these elements will combine with oxygen and oxidize, making the jade surface yellow. Natural oxidation is an inevitable process, especially for older jade.

2. Long-term exposure to pollutants: Jade can easily adsorb pollutants such as smog and dust in the air, and these substances will adhere to the surface of the gem, making it yellow, especially in areas with serious pollution, and jade is more susceptible to such pollution.

3. As a precious gem, jade has a profound historical and cultural background. From ancient jade culture to modern jade craft, jade has always attracted people with its unique charm. There are many kinds of jade, including but not limited to jadeite, hetian jade, opal, agate, chalcedony, wood stone, quartzite jade and serpentine.