Precious stones such as amber try to avoid high temperature, because amber is the product of ancient resin turning into fossils. No matter how long it takes, it's still resin. Try to avoid high temperature.

That white thing is probably polishing wax when polishing gems (but I guess I didn't see your picture after all).

Regarding the film covering, you can see if there is any film near the inlaid part of Lanpo, or if the color of Lanpo has changed after you didn't wash it and washed it. You can find a plastic fake pearl, see the effect of plastic film mulching, and compare it with your blue pearl.

Generally, the price of Lanpo is relatively high. If you buy a large inlaid jewelry of Lanpo for hundreds of dollars, none of it is true.