I succeeded in pollinating both of my flowering Lithops! A discarded eyeshadow brush can be the perfect pollinator if you live in an apartment on the 3rd floor and the bees don’t fly that high.
Both of them produced seed pods filled with ~100 little seeds. I guess they’re going to be L. karasmontana red/beige colored hybrids.
I planted some of them in a small pot to test germination (and you can’t have too many Lithops). Hopefully they will produce healthy little Lithops seedlings in the near future.