Sorry, transferring crystals is not possible.
Let me give you a situation if this is implemented. If a hacker gets into your account, what does he do? He will transfer all your crystals to his account leaving your account empty. In this type of cases, the developers have rejected the idea of transferring crystals from one account to another.
This also has a disadvantage. Let's say if someone hacks your account and transfers all your crystals to his account. The helpdesk might not be able to refund you all the crystals. That's why this idea was rejected.
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