NPT StoneScapes® Puerto Rico Blend .5 BLACK MINI .5 KIT Black Small Pebble Pool Finish .5 Parent Kit. StoneScapes Puerto Rico Blend Small Black creates deep dark green water color that can look gold in very shallow water and is comprised of modified white Portland cement which has been colored with black pigment and natural black quartz pebble aggregates and a specialty blend of small glass bead aggregates. Some naturally occurring seashell can be seen in this pebble mix which comes from the beaches of Baja California. The Puerto Rico Glass Bead Blend enhances the water color in every pool finish by bringing other dimensions of color and reflectivity that only colored glass bead can do. The beauty of this finish comes from the shade and color variations inherent in natural materials.