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If your bracelets are 6" in length then that estimate is approximately correct. My 51mm inner diameter D-shape bangle has a 6" circumference and for me is the perfect balance of snug w/enough movement. I also have a 50.5mm inner diameter princess-shape bangle that fits me well. Both of these I wear on the left only.
Caveat: your knuckles must be flexible and your palm not too fleshy. I made the mistake of forcing the 51mm onto my right hand once & was stuck wearing before I was ready to commit to 24/7 non-removal. I pinched some nerves getting her off and it took months to heal.
Wrist size
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51mm D shape to knuckle room
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Worn
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