Hello! 

Please note that Sapphires are added directly to your balance at the moment when you open the Chest. Hence, just check your balance of sapphires before and after the opening of the chest.

attila said:

Today daily Mar'eth mission provides 25 sapphires if I was between first 10 congreeg players. I was 1st, but the mission did not appear completed ad no sapphires!

Hello, lord! This functionality works quite correct. Each League Mission lasts 24 hours. The quest was not completed since you did not turn to be in the Top-10 at the moment when Mission came to the end. Please remember to create a new topic when you want to report a new case. You can find more info about reporting issues and forum customs in the pinned topic "Bug Report Forum Guidelines and FAQ". Meanwhile, I close this topic.