With the latest update, Crystal TON is available in Lumi now.

Before making any transactions with Crystal TON, you need to activate your Crystal TON wallet first.

Without activation, it won't allow you to send or exchange coins. It's like a transaction with the fee for registration. It requires 0,1 Crystal TON. After that, your Crystal TON wallet contract will be activated and you will be able to exchange and send it.

The unactivated Crystal TON wallet will have a "Not activated yet" warning.

If your Crystal TON is not activated, you will be able to receive Crystal TON, but any transactions with it like Send will be restricted.