A jewelry ring having an outer ring fixedly spaced radially apart from an inner ring by a connecting member where the outer ring defines a plurality of open mountings and the inner ring defines a first plurality of openings, which are aligned with one another. At least two of the plurality of openings in the inner ring are interconnected by a slot to collectively define a receptacle in which a size adjusting device is seated and is connected thereto by a slot and pin mechanism enabling the size adjusting device to translate radially between a smallest interior diameter position and a largest interior diameter position. The size adjusting device has an arcuate insert defining a second plurality of openings aligned one each with one of the plurality of open mountings of the outer ring and has a biasing member seated between the arcuate insert and the outer ring.