I love this nuanced discussion of bangle fit! You ladies are awesome. There is no one I can talk to here about all the interesting things about jade.
NYCP, have you ever thought about having a lapidary shave out some of the inner side & repolish your mother's bangle to widen it? I think it could be done if the inner lip was flattened just a bit, that way it would sit more like a thin D while looking like a princess.
I find that the princesses I have are easier to slide on and off than the D shapes, unless the D is not as wide. Leaf is easier to get off than PL, even though there is only .5mm diameter difference, because Leaf is only 12mm wide and PL is 16mm wide...and Cat is easier to get off than PL even though PL is technically wider in diameter... in that first pic of all the bangles stacked on my arm, they go from largest to smallest diameter from elbow to wrist... Granny Smith is 55-56, FP is 54.8, Lippy is 53.7, Smoke is 52.2, BP is 51.5, Cat is 50.5, and PL is 51.
I think it shows pretty well how all the different dimensions affect how much presence a bangle has on the arm. In the past, I've stacked Cat closer to the elbow because of her height compared to PL. She looks bigger, even if she's snugger.