Accent Stones in Rings and Different Settings Used for Accent Stones Accent stones are the smaller stones that are placed beside the larger center stone in a jewelry piece in order to enhance the overall aesthetics, volume, and beauty of the jewelry. It is not necessary for the accent stones to be diamonds – they can be a variety of other precious or semi-precious stones. Generally, their size ranges between 1 mm to 5 mm (in diameter) which is why you can say that they can range from tiny to moderate, usually set together closely.