I'm starting to believe that gems are unicorns. I've played at least 10+ rank 6/7 tourneys and have gotten a total of 3, THREE, gems. I've only found two online as well...like wtf game
There are 24 gems online everyday for your taking. 2-3 per every 9 hole open course. Check out everybodys.golf There's also a formula that makes farming the gems much easier. The article on everybodys.golf (that's the website) explains it all.
Gems can be random amounts, sometimes I place first and win 2 and other times I have placed 5th and won 5.. and sometimes none at all, all in rank 7 special tourny