it is a tiled swimming pool

The fountain jets are located just under the coping in the 6" waterline area.

Can you tell what material was used for the pool coping? Many thanks

Here's a new way to add color to your pool designs and outdoor living space. Large Format Porcelain with Any Image (i.e. for a pool's sun deck)

These porcelain panels are completely waterproof, frost proof, fade proof, pool chemical resistant, slip resistant, and very scratch resistant. Any image can be kiln-fired as the glaze and it will never fade. Panels are 1200mm x 2400 mm (~47.25" x 94.5") and are 10mm (~0.39") thick (smaller sizes too). The following images are an example of using the look of an exotic stone that would not otherwise hold up well to pool chemistry. For more pictures see my Houzz profile and in particular the project titled "large Format"