A single stone ring typically refers to a type of ring featuring a solitary gemstone as its focal point. This gemstone can vary in size, shape, and type depending on the wearer's preference and budget. Single stone rings are often used for engagement rings, with the central gem symbolizing the unity and focus of the relationship. Diamond solitaire rings are perhaps the most classic example, but other gemstones like sapphires, rubies, emeralds, or even less conventional stones can be used. The simplicity of a single stone allows for the focus to be entirely on the beauty and brilliance of the gem itself.