Well i get 2 gems per day 100% but only normal didnt get any other yet...
but i think u get a GEM when u get one big number of ores....i always get a gem when i mine like 150-200 ores then i get 1 gem and well i get dc becouse i use autominer so then all mines are again on 0 what if u mine like 300-500 mines maybe then u get super or anyother gem...thats why if u dig on same place u keep gaining more slowly ores and that takes u loong to get a gem....
and maybe thats why some ppl think its better to move u get more faster ores etc...
what u think ppl?