I paid money for the Black Gems but I don't see them on my server.
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The in-game currency is – the Black Gems on servers, and the ML$ - on the Portal. 1ML$ = 100 BG. If you paid from the Portal Window, you will receive ML$ that can be found on the Portal.
In order to exchange ML$ for the Black Gems (and so – transfer funds to a server), in the Portal Window open the lower panel for the server you want by clicking the small grey arrow-down button. In the panel, click the Black Gem icon of the “BG transfer” button. In the pop-up window you will be able to transfer the ML$ from the Portal to the Black Gems on the chosen Server without commission or interest.