A three stone diamond ring is a classic beauty. They are a symbol of the past, present and future. That's why three stone diamond rings are perfect for marking an engagement, anniversary or other special occasion. Ross-Simons has a collection of 3 stone diamond rings. Some feature colorful gemstones, too. You can choose a three stone diamond ring in 14kt gold, 18kt gold and platinum. View our Estate Collection for vintage three stone diamond rings.