Definition of the ring stone, and the fact that a ring without a stone has no basis.
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The Shaykh : The ring stone is the widened top of the ring, because this stone is inscribed with "Muhammad is the Messenger of Allah."
This is the known practice regarding the rings of the Prophet (peace and blessings be upon him) and his Companions. As for a ring without a stone, I do not know of any basis for it, such as one that is merely a band. This is especially the case if it is accompanied by a belief, like what a suitor does with his fiancée, or a husband after his marriage, where the husband writes his wife's name on his ring and the wife writes her husband's name on her ring, and each believes that this is a cause of the bond between them. Some of them, if they have a gold ring of this type and are asked about it, say, "I am afraid that if I remove it, the woman will be upset," meaning the wife, because they believe that removing it means he wants to remove her and distance her from him. These are corrupt beliefs that are not permissible for a Muslim to hold.
This is the known practice regarding the rings of the Prophet (peace and blessings be upon him) and his Companions. As for a ring without a stone, I do not know of any basis for it, such as one that is merely a band. This is especially the case if it is accompanied by a belief, like what a suitor does with his fiancée, or a husband after his marriage, where the husband writes his wife's name on his ring and the wife writes her husband's name on her ring, and each believes that this is a cause of the bond between them. Some of them, if they have a gold ring of this type and are asked about it, say, "I am afraid that if I remove it, the woman will be upset," meaning the wife, because they believe that removing it means he wants to remove her and distance her from him. These are corrupt beliefs that are not permissible for a Muslim to hold.