I wanna extract the material (in png) for the vanilla earrings. But I couldn't find them under the finder tab. I used the NameMap Search and put int many different searchwords and keywords like earring, uuaccearring, acclearring, accearring, ballstud. But I couldn't find any lifo or txtr files for them. So either I am using the wrong search queries or they just don't exist in SimPE. The material definitions exist for some of the earrings but I couldn't find them all. Any ideas?

The simple, single-colored gold/silver jewelry don't seem to have any lifo or txtrs. They don't need a texture, so they're colored through the TXMT only.
They are linked to an Envcube texture that gives it reflection, but that's all.

If you find the TXMTs for an item you can't find the TXTR/LIFO for, you can look at the "stdMatBaseTextureName" parameter to find the name of the TXTR, and in the TXTR resource to see if there are LIFOs connected to it (usually the 512 + 1024 sizes). I there isn't a "stdMatBaseTextureName", the TXMT likely isn't linked to a TXTR.

Thanks for the info I will look into it. And I actually found an env cube texture and a rgb color code for, I think it was, the studball earring.