18kt white gold Portraits of Nature butterfly diamond necklace from DE BEERS featuring 18kt white gold, clasp fastening, marquise cut diamonds, round cut diamonds, polished finish and butterfly print. A De Beers Jewellers Certificate of Authenticity accompanies all jewellery purchases. This certificate guarantees the authenticity of your De Beers Jewellers diamond jewellery; the finest quality materials and utmost care were used to craft this item to ensure its brilliance..