Cheers, Salj!! I've added a sheet in my shared google sheet documenting your findings, and providing a place to catalog more numbers. For those watching in the crowd: please submit your own numbers if 1) they differ from what we've found so far, or 2) if you have a number of members or stones that isn't yet cataloged! I'll need more data to fill this out, but it seems to be that: * if you have an odd number of members, you should sell stones in increments of 1, 2 or 7. * if you have an even number of members, you should sell stones in increments of 1, 2, or 10.