Am really confused, please ping.

There's 5 ways to earn diamond's:
1. Use money from real life to purchase them.
2. Go to the trade tab, and click currency exchange. Here you can buy diamonds with gold, or buy gold with diamonds. Users will set up offers for you to buy.
3. Official special events can earn you diamonds. For example, the Advent calendar gave out different prizes every day, one day it was diamonds. Sometimes the admins will host contests as well, and the prizes may include gold, diamonds, special avatar items and more.
4. Non-offical games. Users can host their own games in the 'games, contests, and giveaways' topic. Users can do raffles, contests, etc. And sometimes the prizes include diamonds.
5. Lastly, if you earn a valuable pet, item, or avatar item you can sell them to others for diamonds.