Bouton Stacker ring heart . This beautiful BOUTON stacker ring is designed to be worn alongside 2 or 3 other stacking rings from the BOUTON collection. This ring is made from pure 925 sterling silver and includes a brilliant-cut sparkling diamond inspired centre stone with the shoulders accented with micro pave detail giving a total carat weight of 0.95. BOUTON is a beautiful new range of sterling silver jewellery featuring the highest quality cubic zirconia diamond inspired stones in natural gem colours. Each BOUTON design arrives elegantly boxed and includes a 2 year international warranty.