NPT StoneScapes® Regular Pebbles FRENCH GRAY REGULAR 1/2 French Gray Pool Finish .5 Parent Kit. StoneScapes Touch of Glass 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, white Black and White glass bead accents. The glass bead accents enhance the water color by adding additional pops of color and contrast that only colored glass bead can do. The beauty of this finish comes from the shade and color variations inherent in natural materials.