There's no single definitive answer to which finger is specifically "for single ladies." The tradition of wearing a ring on the left ring finger to signify marriage is primarily a Western custom. Therefore, a single woman can wear a ring on any finger she chooses.
Popular Choices for Single Women's Rings:
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Index or Middle Finger: These fingers are more prominent and allow a statement ring to stand out. This is a common choice for single women wanting to wear a ring (Reference: https://minimalynn.com/blogs/news/which-finger-to-wear-ring-for-single-female).
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Any Finger on the Right Hand: Wearing a ring on the right hand avoids the common association of the left ring finger with marriage, providing complete freedom of choice (Reference: https://minimalynn.com/blogs/news/which-finger-to-wear-ring-for-single-female).
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Avoiding the Left Ring Finger: In some areas, especially North America, wearing a ring on the left ring finger may lead to assumptions of engagement or marriage. Single women might prefer to avoid this finger to prevent misunderstandings (References: https://www.quora.com/Why-do-so-many-single-women-wear-a-ring-on-their-left-ring-finger, https://www.reddit.com/r/jewelry/comments/vkdpo1/how_to_wear_rings_as_a_single_woman/).
Ultimately, the finger a single woman chooses to wear a ring on is a matter of personal preference and style. There are no hard and fast rules.