After getting something good, it's always a dud... ㅠㅠ

Argh, a few hours ago I saw an ad for a brownish(?) treasure chest, opened it, and got a 5-gem booster! I thought I had the luck of the century, but as expected, my luck ran out. I was doing my next daily quest, watched an ad, and opened a silver chest, only to get the worst possible item: an EXP Up Potion...