Very nice plant Alain. Your L. naureeniae is larger than mine; maybe it's a matter of age. Mine is still young five years from seed. I really like your photos of the flowers when they are new and not completely covering the plant. It's nice to see both flowers and the lovely leaves. I'm going to try and take some lithops photos like that next year.
The plant is in a 5cm pot and was raised from seed. This was the first time it has flowered.