Necklaces with 2 to 5 linked rings hanging from them, each with a different name engraved.
https://media.mathstodon.xyz/media_attachments/files/115/590/016/486/543/680/original/3d82581af249bccb.png
I feel sure these are intended for people with this many children but they seem like a really cute polycule gift
plus the polycule version could have the rings linked according to who is dating who
imagine the jeweller like "sorry, you either have to break up with david or start seeing jen, otherwise your necklace is mathematically impossible"
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