Lab Grown Viviana One-Quarter Coverage Lab Diamond Engagement Ring - 18K White Gold. This classic engagement ring features sparkling scalloped pavé diamonds that extend one-third of the way around the ring. A diamond adorned gallery and graceful claw prongs embrace the center gem (1/6 total carat weight). Our perfect fit engagement rings are carefully designed to sit flush against a variety of wedding rings for a seamless look with no gaps.