Login to Gems of War frequently to gain free rewards. There are weekly, Revered and monthly calendar rewards to collect. Miss up to 3 days on longer months before forfeiting the Monthly rewards.
Log in to the game each day to unlock a Daily Reward. For additional rewards and free resources try to log in more than one day in a row for calendar rewards. These are separate to the Daily Rewards you earn depending on your, which can be viewed with your Guild Seals in Guild > Manage Tasks & Seals.
Collect login calendar rewards
The "day" is counted every 24 hours from 7 AM GMT (when the 'Daily reset' occurs). To see your calendar rewards select the Calendar icon from the World Map on the far right, above the Settings cog. Rewards are delivered to the in-game Mail and previously collected Rewards will show in the Collected mail tab.
Missing login days
If you miss a day of logging in and there is more than 28 days in the month then you can return to the game without missing a Monthly reward for up to 3 days.
Every additional calendar date in a month past 28 days earns a day of "grace" as there are only 28 rewards. For example, if there are 31 days in October you only need to log in after 3 days otherwise you will forfeit the Orb of Chaos and rewards and the end of the month.
After logging in more than one day you begin collecting 7-day login rewards.
Monthly calendar rewards
Log in each day of the month to receive additional monthly rewards. There will always be 28 days of monthly rewards, even if the month is longer. If the calendar or date month itself has more than 28 days then you have you can miss an additional day of logging in before you can't earn more rewards.
If you reach the Honor Rank of Revered - congratulations! Every 7 days you will receive an additional reward.