If you purchased a companion diamond in Daidai companionship, you can withdraw it according to the following steps:

1. Open the Daidai companionship APP and enter the "My" page .

2. Click "My Wallet" and select "Withdrawal".

3. Enter the withdrawal amount and withdrawal method (Alipay or bank card), and fill in the relevant information.

4. Click "Submit Application" and wait for review.

5. After approval, the withdrawal amount will be transferred to your Alipay or bank card account.

Please note that cash withdrawals need to meet certain conditions and restrictions, which are subject to the regulations of the Daidai companion app.