This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.
This has always struck me as such a strange argument against buying a diamond ring, because it's true about every retail purchase. If you buy a chair, then turn around and try to sell it back to the store, you'd be lucky to get 30%, but no-one thinks that's an argument for sitting on the floor. You buy a chair because you want to sit on it, not as the start of a complicated chair-resale scheme. Similarly, you buy a diamond ring because you (or your beloved) want to wear it.
Note: I am not blaming you in particular, because this is a popular argument, but talk about a selective demand for rigour!