NPT StoneScapes® Puerto Rico Blend Small .5 FRENCH GRY MINI .5 KIT French Gray Pebble Pool Finish .5 Parent Kit. StoneScapes Puerto Rico Blend Small French Gray creates light gray to medium blue water color and is comprised of modified white Portland cement which has been colored with French gray pigment and natural black and white quartz pebble aggregates and a specialty blend of small glass bead aggregates. 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.