Thank you so much
@Serpenti_Love @pinkdewy @Maria333 @Moxisox @m-s-m-d for all your really helpful insights and advice!! I was convinced by the Youtube reviews at first that talked about the d'amour necklace flipping and turning (especially the smaller sizes), but your reviews here have been extremely helpful. After trying in store again with my own extender, testing out different lengths and just moving around to see how the necklace moves on my neck, I felt that it didn't turn beyond 20 degrees to the left or right, and the diamond would flip yes but flip right back again, so that's all fine with me. The diamond definitely rides up the neck about 2cm or so though, no matter what length the full necklace is, and that's normally where the diamond will settle on the neck for most of the time. Something I took note of. Overall I was happy with the wear of the necklace despite the small flippings, so I happily bought the large d'amour necklace!

I will of course still observe how it wears over time!