Our signature ring stack trio. Made from 14K certified recycled gold, natural white agate and diamonds. Features: The Single Line Diamond Band offers crisp sparkle and precision-cut accent diamonds. The hand-carved Essential Gem Stacking Ring in White Agate adds a striking shock of white to the stack, making it. the perfect complement to a white shirt. The Albert 2.0 Ring in Gold anchors the stack with classic form and versatile wear.