Originally Posted by
ropepirate
The obstacles spawn at a rate of one every 8 hours and on average the removal of one results in 2 gems. The actual sequence for number of gems is 6, 0, 4, 5, 1, 3, 2, 0, 0, 5, 1, 0, 3, 4, 0, 0, 5, 0, 1, 0.
Gem boxes always contain 25 gems and the proposed spawn rate was 1 box per week though it appears from your data that this is actually 1 box every 10 days.