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DR diamond ring can only be bound with one ID card, and one person can only buy one. In addition to customizing the real name of the ID card, Dr. Diamond Ring also needs to sign a true love agreement when purchasing, which binds the man's ID card with the woman's name. Once signed, it cannot be changed or deleted, ensuring that it will be unique for life and the purchase record will be kept forever. In this way, the verification information of the ID card will appear when purchasing for the second time, and it is impossible to continue the next purchase.