9752631221 12' x 21' Oval Diamond Series Mystic Above Ground Pool with 52" Walls. Designed to stand the test of time, the Diamond series is our most prestigious. Its authentic and iconic style will transform your outdoor space into an urban and convivial environment. This series has the widest and strongest top ledges and vertical supports in our collection The new MYSTIC model is sure to provide a glamorous, upscale look to your space. The brushed metal wall design in elegant charcoal tones is a show-stopper in any outdoor installation.