Kay Jewelers Diamond Engagement Ring 1 ct tw Princess-cut 14K White Gold- Engagement Rings: It has been nearly a century since Marcel Tolkowsky revolutionized diamond cutting with the original Ideal Cut Diamond. The tradition continues with the Tolkowsky® modern Princess Ideal Cut Diamond. Round diamonds complement the center stone as they sparkle below and add brilliance to the 14K white gold band. The engagement ring has a total diamond weight of 1 carat. Each Tolkowsky® diamond ring comes with a certificate of authenticity and independent certification of the center stone.