This week’s stack is inspired by the ruggedly beautiful wilderness of America’s first national park, Yellowstone. With each ring we add more layers of pristine natural beauty: from Rebecca Overmann’s five gray diamonds, bubbling up like so many geysers, to the deep-cut river gorge studded with inverted diamonds in Todd Pownell’s wide gold Fissure band, to the rocky mountain faces of Todd’s gray diamond and 18k white gold Dual Forces ring. And of course our final ring, the literal yellow stone: the geologic wonder that is TenThousandThings’ 0.60ct cushion cut yellow diamond solitaire.