Players who watch videos and never (or seldom) receive Gems for them may have their browser Privacy settings set too high. Luckily, it's easy to change your settings so you can enjoy Gems from the ourWorld, downWorld, and Vegas World video offers.
Click the Tools icon in the upper right (looks like a gear) or type (Alt-X)
Select "Internet Options"
Select the "Privacy" Tab
Set the Settings to Medium or "Accept All Cookies".
Click the "Customize and Control Google Chrome" button in the upper-right of the screen. (Looks like three horizontal lines.)
At the bottom of the list, click "Show Advanced Settings"
Under the Privacy header, click "Content Settings"
Under the Cookies header, make sure the "Block Third Party Cookies and Site Data" box is UNCHECKED. If it is checked, videos will not award Gems.
Click the Firefox tap in the upper-right of the screen.
Select "Options" from the drop-down menu.
Select "Options" (again) from the next menu.
Select the Privacy Tab
Under the "History: Firefox will:" dropdown menu, select "Use Custom Settings for History"
Make sure "Accept Third Party Cookies" is checked. If it is unchecked, you will not be able to earn Gems from videos.