Side quest just gave me diamonds?

[CDmark]

Well, I aged up in G world, LMA to Colonial. So, I was moving along techs, doing recurring quests, story quests and some side quests I came across Rinbins Rant, easy one so I did it. Got 131 diamonds which is what I get for L91 CF and the 20 diamond RQ reward. I thought side quests dont give diamonds. It was a random reward and Wikia also has it as random reward.

 

[UBERhelp1]

A random reward has a very small chance of giving diamonds. There are also side quests that give specifically diamonds. It's definitely possible