I would love to see birthstone gems included along with the gems we have now. (ex. Ruby is the birthstone for people born in July.)
I think a super cool way to add these gems could be as challenges for each month you’ve been using the Opal app! It could either be through a daily check-in system or something better like a challenge along the lines of “You are rewarded with the gemstone of this month for snoozing Opal less than 5 times this month.”
Another way to add gems could be through the leaderboard. Top 1% could get a super rare beautiful gem while top 50% get a more common type of gem.