Suiseiseki holding a ring.

The rings are how the Rozen Maidens form contracts with their masters. These are bound to the actual dolls, and not to their Rosa Mystica or their artificial spirits. A contract is formed using them by kissing the ring.

It is possible for a doll's ring to be kept after their death, and for a contract to be formed with a master afterward, which can begin to revive the doll, although a Mystica is needed to complete the process.

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