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. If you talk about diamond engagement rings, diamond accents are found in trillion cut, baguette cut, or small round diamond shapes.