I have my son paid the stones before the 'official' Recommended age ... jiffy he has identified his personal favorite and stones that were naturally thrown beknabbert, durchgelutscht. Now, after several months, I can confirm with a clear conscience that the color problems described in an earlier review are definitely not occurred - perhaps the customer had then really a "Monday pack" caught.
Meanwhile, my son can be built and older is with the stones - but sometimes it looks a stone but then very carefully and is fixed totally on this stone. Really special this fantasy stones.
Price: Yes, he is for "building blocks" of high - but these devices are really worth: Super fun and absolutely solid construction!