Hi 2boys yes! I was trying to find some articles but not v easy. In ancient times when polishing was not as good, the change in Hetian jade would be more obvious. People say that the change was due to the touch by the wearer. The change in the appearance can be classified to oil, transparency and texture. Some even claim the inclusion would become less obvious.
The change probably is less obvious nowadays given all the products are well polished. But I’m still interested to see how it goes.
I found these photos online to show the before and after. The beads in latter photo are more shiny....
Before
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After
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