I don't know if there is a definitive list.
The best way I have found is by trial and error.
So, for example, now jewellery is eligible for Simple Delivery, if I list a 'set', I have to use SD. If I list the brooch and earrings under brooches, I can still list as a Large Letter and use my own postage policy.
Have a trawl through other listings from private sellers and note where postage is still clearly set by the seller rather than being SD.
I realise this is time-consuming and far from ideal!
Hopefully, somebody else will be able to offer a better solution.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)