There now is some evidence that a pea ∅ does not quite serve as a rule for the size of Lithops seedlings. To big in most cases and far to much volumen in comparison to the body of a junior living stone.
Here comes the common peppercorn. Nearly 5 mm and only a quarter of the volume of a pea. That will make the difference.
Lets see if it works:
L. hookeri C019 and a pink peppercornL. dinteri C206 and a pink peppercornL. hallii C119 and a pink peppercornL. fulviceps C266 and the pink peppercornL. karasmontana ‘Top Red’ and a peppercornL. pseudotruncatella C068 and a pink peppercornWhat do you think? A peppercorn fits better, doesn’t it?
And it works for Conophytum as well. This C. violaciflorum just hatched in its first winter/rainy season.