This model contains a simple ring and a ring with gem, same as https://civarchive.com/models/20975/nipple-ring-piercing

However, it is hard to generate a gem one, therefore I will update the model above with gem ring only.

prompts for simple ring (only add nipple piercing if it doesn´t generate well): nrp, nipple piercing,

for gem ring: nrpg, nipple piercing, blue gemstone,

negative prompts (if you add nipple piercing and blue gemstone in positive prompts): ear piercing, necklace, chest jewel, navel piercing

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