Thank you, Purse Nut and Silver Mom! The bangle I bought was 54 x 49 mm inner diameter, I think I'd need at least 2 mm more to feel comfortable... But I'mI not sure how to translate this experience to av round bangle. I'm pretty sure my hands are a little bigger in the summer heat than this late winter/early spring chill, so I'm thinking I ought to aim for larger! XD
I will have to snap and share a photo of the little bangle before I send it back out, it's got rich color with areas of nice translucency.