In addition to being able to purchase gems with PayPal, a credit card, and a cellular phone you can purchase them with Facebook credits!
Here is how:
1. Login to ourWorld from http://w02.ourworld.com/ow/members/?env=facebook
2. Navigate to the “For Free” tab
3. Click “Get Gems with Facebook Credits”
4. Select the number of gems you wish to purchase and click “Check out”
You will then be prompted to login to Facebook and that’s it, yet another way to purchase gems!
Want to learn more about Facebook credits? Click here!