Bangle sizing is not wrist sizing. The ring has to pass over your knuckles to get to your wrist, so the measurement that matters is your hand at its widest point.
Visually Speaking
The incorrect width of a box clasp announces itself immediately. If it's too wide on a delicate necklace or too narrow on a substantial bracelet, the clasp stops being part of the jewelry and becomes a comment on it. Proportion is what makes a closure neatly comply into the piece it serves.
Style Notes
The appeal of 14kt white gold for colored gemstone settings is optical: its neutral finish introduces no warm color interference, allowing the stone to display its true hue without the color modification that a yellow gold setting produces. This makes it the preferred choice for designs where gemstone color accuracy is a priority.